Choose the word or phrase among A, B, Cor D that best fits the blank space :
For most of their time in orbit, astronauts are fully  ……….with repairs and scientific experiments.

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• In its pure State, aluminum is a weak metal, but when combined elements such as copper or magnesium, it is formed alloys of great strength

• Haywood Broun was a read widely newspaper columnist who wrote during1920’s and 1930’s

• Jobs which are highly paid some countries are badly paid in other

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• Rice is most important plant Viet Nam

• Abigail Adam’s letters to her husband pre a graphic picture of the age which she lived.

• Inventing by Roger Bacon, the magnifying glass led to the creation of scientific tools which have produced immeasurable scientific progress

• Most types dolphins live at less twenty-five years, and some species may reach 50 years of age

• The sum of all chemical reactions in organism’s living cells are called its metabolism

• In 1984, the world population rose to over 4.7 billion, up almost 85 million from an estimate made the year ago.

• He's finished this test, _    ?

• The wooden fence surrounded the factory is beginning to fall down because of rain 

• The homes created by  legendary architect Frank Lloyd Wright are still viewed as uniquely, innovative, and valuable.

• Choose the word which has a different stress pattern from the others.

• The early periods of aviation in the United States was marked by exhibition flights made by individual fliers or by teams of performers country fairs.

• Woody Guthrie wrote thousands songs during the lifetime, many of which became classic folk songs

• Most babies will grow up to be as clever as parents.

• The international Red Cross, which has helped so many nations, won the Nobel Peace Prize three times for efforts to reduce human suffering

• Many hundred years ago, there were many villages and little towns in England.

• Today there is an unusually large amount of students in class

• When the sky is blue and the sun is shining, you may say to your friends "____________"