We should prevent such a silly mistake _____ again.

(2013·兰州名校二模)She will tell us why she feels so strongly that each of us has a role ________ in making the earth a better place to live in.

As a reporter, you should first decide what events ____ before you make some interviews．

Many buildings in the city need repairing, but the one ______ first is the library.

 With globalization ___________ the world, learning foreign languages, particularly English, will become increasingly necessary if France is to compete economically.