1.Chinese is used __as__(for / as /by / to )the fristlanguages in china
2.he is looking for a room to ____live in__(live in/ live /live on/ lives)
3.to drink unless something __is done__(was done/ will be done /to be done/is done)soon
4.it is reported that the underground line no.3 __will be built___(will build/has built/will be built/has been built)in our city in2010
5.betty is often seen _to help _____(help/to help /helped/helps)the old man with his housework
6.when you leave the room,make sure the door_is locked____(was locked/is locked/will locked/should be locked)
7.when she heard the exciting news,she could feel her heart _beating____(beats/beating/to beat/beaten)fast