Lawrence Craven, a doctor from the USA, is the author of several published reports, one of ________ introduced the idea in 1953 _________ aspirin could reduce the risk of heart attacks.
| A．them; when | B．which; that | C．what; that | D．which; when |
He kept the light in his room________the whole night.
| A．burnt |
| B．burning |
| C．burn |
| D．to burn |
________you put your heart into your study, you'll feel________in it.
| A．Once; interest |
| B．If; interested |
| C．Since; interested |
| D．When; interesting |
That is the place where I________when I was a child.
| A．was used to live |
| B．used to living |
| C．used to live |
| D．am used to living |
The classroom is big enough________， but we'll have to move if we have more students.
| A．for the moment |
| B．on the moment |
| C．in a moment |
| D．for a moment |
We went to Canada to travel and my cousin________as our guide.
| A．palyed |
| B．showed |
| C．acted |
| D．performed |