1. He has been in China ____ 1960.
A. since
B. for
C. ago

2. He has been in China ____ 50 years.
A. since
B. for
C. ago

3. He lived in China 50 years ____.
A. since
B. for
C. ago

4. I remember that I was here ____.
A. now
B. before
C. after

5. He will not be back ____ 6 o'clock.
A. before
B. after
C. by

6. He will die ____ a few days.
A. before
B. after
C. in

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