Although Yuri Gagarin first space flight lasted only 108 minutes, it gave encouragement to those who were interested in the future of manned space flight

In recent years, there have been  great increases in a number of engineers and scientists employed in American industries.

If they ______ down that old opera house, we would not have any historical architecture left in the city.

Physical fitness does not guarantee good health, but they provide a big step toward living a long and healthy life.

She began cleaning the wound with ______

If I ______ the lottery last week, I ______ rich now.

He got divorced, ______ his parents had done years before.

Plants and animals require water that are moderately pure, and they cannot survive if water is loaded with toxic chemicals.

The volunteers collect tortoise eggs ______ tortoises form being extinct.

Water pollution can kill a large number of fish, birds, but other animals; in some cases it may kill all members of a species in an affected area.

Have you seen my ______?

Experts in psychology believe that for many people money is an importance symbol of strength and influence.

“Gone With The Wind” ______ since last week.

Some of the students began to fall asleep ______.

Our current assignment requires ______ reading.