He met many problems------ he was going over his lessons.
I became a student ten years . I have been a student 1996. 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.