____ the days he had spent with his American friends, he couldn’t help_____.
| A．Keeping up; smile | B．Staying up; smiling |
| C．Looking back on; smiling | D．Looking at; to smile |
We talked about the things and persons ______ we remembered at school.
| A．which |
| B．what |
| C．whose |
| D．that |
John said he’d been working in the office for an hour, ______ was true.
| A．he |
| B．this |
| C．it |
| D．which |
New York, ______ last year, is a nice city.
| A．that I visited |
| B．which I visited |
| C．where I visited |
| D．in which I visited |
You can take any book ______ interests you best.
| A．it |
| B．that |
| C．this |
| D．what |
Do you still remember rge chicken farm ______ we visited three month ago?
| A．where |
| B．when |
| C．that |
| D．what |