People _____hobbies because theseactivities can offer enjoyment, friendship, knowledge and relaxation.

It’s clever _____ her to work out _____ many difficult math problems.

Bob swims _______ than I, but he doesn’t swim my brother.

Living in the country，Peterdoesn’t write often，but we do hear from him________.

Put it down, Jim. You mustn’t read ______letter.