Various optional courses being available, we can choose ________ based on our own interest.

do your friends often communicate with you on wechat微信? Yes. Sometimes. It’s ___ we enjoy doing at weekends.

Charlie Chaplin found __________ difficult to entertain the audience at first.

Of the two brothers, Bill is ______ younger one, and he is a quiet boy, ______ that most adults like very much.

There isn’t ______ with your bicycle, you can ride home.