Common Errors in English Test: Than Then

Since then^, more than five-thousand-three-hundred-people have walked all of the Appalachian Trail.|Union Carbide then^ threatened to suspend more than six-hundred workers.|Until then^, General Electric released more than four-hundred-thousand kilograms of the chemicals into the river.|Since then^, it has made more than one-hundred-fifty recordings.|Then they put the virus into more than^ two-hundred eggs from rhesus monkeys.|In the forty years since then^, more than one-hundred-sixty-thousand Americans have served as Peace Corps volunteers.|Since then^, more than two-hundred-fifty cases of the disease have been reported in Britain.|Then the man bought a copy of a map of the area printed more than^ one-hundred years ago.|The scientists then^ forced the embryonic stem cells to develop into several kinds of cells found in the organ called the pancreas.|The cells then^ formed structures very similar to the pancreatic structures that produce insulin.|The researchers then^ removed the genetic material from a mouse egg.|then^ he and his second wife moved to Ghana in west Africa.|Back then^, the holiday was called Decoration Day.|The scientists then^ forced these embryonic stem cells to develop into several kinds of cells found in the organ called the pancreas.|The cells then^ formed structures very similar to the pancreatic structures that produce insulin.|The researchers then^ removed the genetic material from a mouse egg.|then^ it hid the dead deer under water.|Since then^, John Grisham has written one book a year.|then^ they edit each other's work.|But then^ Sarah Ferguson tells the little girl that she should learn about investing her money.|then^ you cut and collect some grass.|then^ you build a box from the four pieces of wood.|then^ fill it with the cut grass.|then^ put the bag in a big container of water.|then^ they reproduce again.|then^, the discovery of the insect poison D-D-T led to efforts to try to end the disease completely.|It probably killed all of the huge reptiles called dinosaurs that then^ ruled the Earth.|then^ they go back to their villages to provide health care and to teach others what they have learned.|then^ the bride and groom will kiss.|then^ he heard about Marshall Strome of the Cleveland Clinic.|Clinic doctors then^ searched for six months for the right larynx for the transplant operation.|then^ special tools will help the scientists identify the chemicals found in the sun.|Human waste is treated by the microbes and then^ used to help new plants grow.|The players watched the spinners move in circles for six seconds and then^ land in one of the areas.|then^ it will move to the Kennedy Library in Boston, Massachusetts.|then^ the visitor sees clothes from the White House years.|then^ they will keep all the investors' money.|The Columbia River was at the center of the new American settlement in Pacific Northwestern territory, then^ known as the Oregon Territory.|Before then^, about twenty-five-thousand salmon swam up the Columbia River into Canada to lay their eggs.|then^ the yellow part of eggs is added and the mixture is dried in the sun.|The mixture then^ is put into small vitamin capsules that can be swallowed.|then^ they compared these damaged hearts with those of ten patients with normal hearts who had died of other causes.|then^ it would be reprocessed into fuel.|Doctors then^ would place genetic material from the woman's husband into the egg before putting it in the woman's uterus.|The Iraqis have been using the radar near Baghdad to find American and British planes, then^ fire missiles at them from the south.|Until then^, we leave you with the Glenn Miller Orchestra playing "String of Pearls".|then^ many more people will be able to enjoy "The Eyes of History."|These agreements then^ go to the governments of each country for approval or rejection.|then^ the golfer must be able to hit the ball carefully for a short distance to get it into the hole.|However, the experts say people should not have more than^ two-thousand milligrams of vitamin C in foods and pills each day.|They say people should take no more than^ one-thousand milligrams of vitamin E in pill form each day.|The experts say people should not have more than^ four-hundred micrograms of selenium a day.|Scientists estimate that the waves caused by a possible underwater landslide could be more than^ six meters high.|And, the waves can be more than^ thirty meters high as they move toward land.|Two years ago, more than^ two-thousand people died when a tsunami struck Papua New Guinea.|At that time, there were more than^ three-million cases around the world each year.|Now, there are fewer than^ one-hundred-thousand cases of the disease.|The Bill and Melinda Gates Foundation gave the coalition more than^ twenty-eight-million dollars.|Every year, more than^ one-million people from all over the world visit a huge animal park in the western state of California.|More than^ two-thousand animals live there as they do in the wild.|This area is home to more than^ four-hundred kinds of animals and thousands of plants and trees.|Some of them are more than^ thirty meters high.|The area cost more than^ three million dollars to build.|He said these harmful actions have already killed more than^ twenty-five percent of the world's reefs.|More than^ four-hundred-thirty people have died in violence in the West Bank and Gaza in the past six months.|On Tuesday, Microsoft shares lost more than^ fourteen-percent of their value.|They will plan action to fight a disease that affects the African continent more than^ any other.|Malaria kills more than^ one-million people each year.|The World Health Organization says malaria attacks poor people more than^ any other disease.|However, more than^ ninety percent of malaria cases are in African countries south of the Sahara Desert.|Some harmful insects are more easily treated with biological controls than^ with chemical ones.|It is estimated that more than^ one-million people around the world suffer from multiple sclerosis, which also is called MS.|More than^ half of MS patients have this form at any one time.|The Icelandic sagas say Leif and his crew then^ sailed south for about two days and saw more land.|Leif then^ decided to return to Greenland.|Back then^, the holiday was called Decoration Day.|Officials noted then^ that drought conditions are a threat to individuals, agriculture and industry.|In the twenty years since then^, small explosions, many small earthquakes and other volcanic events have been recorded at Mount Saint Helens.|