The two companies decided to （ ） on a project concerning animal cloning.

What （ ） would happen if he told mom and dad what we had done?

Most people make such mistakes （ ） in their whole life.

Many people prefer the bowls made of steel to the______ made of plastic.

Do you mean this is the_____decision you have made after thinking for hours?

The patient’s progress was very encouraging as he could_____get out of bed without help.

The engineer （ ） my father works is about 50 years old.

These tickets for the performance are （ ） until the end of the month．

To save energy, people have to （ ） their electricity consumption.

（ ） you decide to take up, you should try to make it a success.

Frankfurt, Germany, is one of the most （ ） populated regions in Western Europe.

（ ） we can succeed or not depends on how well we cooperate with others．