You must stop and wait for your turn when you see the sign______.A. B. C.
I became a student ten years . I have been a student1996. I have studied here_____ about 10 years. A. ago, since, for B. ago ,for ,since, C. ago, before, for D ago, in, after
Now the air in Yancheng is _______ than it used to be . We should do something to stop it .
--- Did you hear that Malaysia Airline Flight MH307 disappeared off the coast of Australia --- ______ bad news it is!
The old man lives ____ in a small house, but he doesn’t feel_____.
We spend as much time as we can _____ English.
B. 
C. 
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