He runs faster than _______ in his class.

Teenagers are warned to be careful when making friends online, because when you can’t see a person, they could be __________.

A child who lives in an uninteresting environment will develop less intelligence than ______ who lives in a rich and changing environment.

Ms Wang is an excellent teacher.           in our class loves her．

They were all very tired, but ________ of them would stop to take a rest.