How would you like     if you didn't see me for two or three days?

 To save class time, our teacher has ____ students do half of the exercises in class and complete____ for homework.

---Which book do you think is the most useful to my studies?---________, as long as you read it. In fact, they are out of date.

The best job is_______which uses your skill in doing something together with your interest in the subject. 

Many people like to talk about generation gaps. I don’t think there is       in my family, though.