This machine is very easy ______. Anyone can learn to use it in a few minutes.

It takes us about an hour ________ our homework every day.

I enjoyed the performance very much. — Yes, it was really good. I think ________ boy in white was the best actor.

Would you mind _____ your school things on the bed ? —Sorry. I won’t do it again .

The weather in Guangzhou is hotter than_____ in Harbin.