The fire made _____ difficult to rescue the people trapped under the ruins in the earthquake.

What do you think we can do for our aged parents?—You________do anything except to be with them and be yourself.

Are you always online–Yes. It often _____ me a lot of time to read the web pages I like. It’s the best way to kill time.

How long have you________—Since two years ago.

Jack wasn’t saying anything , but the teacher smiled at him_____he had done something very clever