Help others whenever you can ______ you will make the world a nicer place to live in.
| A．and |
| B．or |
| C．unless |
| D．but |
After ________ hard, I got a job in a gold mine.
| A．to try | B．tried | C．trying | D．try |
It's helpful to put children in a situation ________ they can see themselves differently.
| A．that | B．when | C．which | D．where |
After visiting China，most of the foreign friends said they would never forget the time ________ they had spent in China.
| A．that | B．what | C．when | D．at which |
－ Where does Mr. Black Live ? Can you guess?
－ Sorry , I can’t guess ________.
| A．where does he live | B．where he lives in |
| C．where does he live in | D．where he lives |
I’m sorry I didn’t hear what you said. I ________ the picture.
| A．am looking at | B．looked at | C．has looked at | D．was looking at |