Tom’s uncle has devoted _________ to charity since he came to China 20 years ago.

The officer ordered the policeman to _____ that tall man in a black hat. He thought the man might be the murderer wanted.

Alice,we should be more careful to avoid _____mistakes in paper. – Yes,you’ve right.But it is too difficult.

It was in 2008 ______ a terrible earthquake hit Wenchuan, Sichuan Province.

We_______onthis project for four hours Let’s have a rest