We will fly a kite if your homework _______ before 3 o’clock.
I wonder when they ________ for Beijing. I will go to the train station to see them off when they _______.
–Which would you like, tea or coffee? --_______. I really don’t mind.
When the students were playing games on the playground, Jim suddenly stopped _____and began to cry, so we stopped _______ what was wrong with him.
There is _______ wrong with this commputer. It doesn’t work well.
–You should be _______ careful when you take the chemistry exam.--I agree. In this way, I will make _______ mistakes.