You may not understand what they have done, because they ____ a younger generation.

Jane is a smart girl in theclass who is prettier than _______.

.Inthedarkstreet,therewasn’tasingleperson,_______shecouldturnforhelp.

The documentary Under the Dome (《苍穹之下》) which ________ by Chai Jing showed us that the air pollution in China was very serious.

We have got a ticket _____ 300 yuan ______ the sofesleeper.