We haven't got enough books for everyone; some of you will have to _______.

Doctors are doing research to find out what happens physically when people _________ smoking.

Filled with anger, he didn’t shout or swear, but just ________ silently at me.

Successful people have some good qualities and above all, they are never ________ a simple life so they keep fighting until they are top ones．

It’s so surprising to hear from my school teacher again. ______, we last met more than twenty years ago.