It is importantpeoplelearn team spirit.

Did you see Mr. Smith when you were in France?— No. When I _______ France, he _______ to China.

Did you find the small village yesterday?—Yes，without any difficulty，for it has ________ changed over years.

The ________ boy ___________ the fire on May 10th.

If you have lost a library book, you have to ___it.