In the experiment we kept a watchful eye （ ） the developments and recorded every detail.

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

If I had remembered （ ） the window, the thief would not have got in.

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

When I got my first job, I _____ early. But nowadays I usually stay in bed until late morning.

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

The audience stood and （ ） at the end of the performance.

It was only by a great effort of will and courage that he was able to （ ） himself together.

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

Realizing that he hadn’t enough money and _____ to borrow from his father, he decided to sell his watch.

Many students thought about the third question for quite a while and had great difficulty answering it. Obviously， it was _____ all.

_____ finished his work, he had to stay at home on the weekend.