From his _______expression, we can guess that the problem maybe was quite _______.
| A．puzzled ; puzzling | B．puzzling; puzzled |
| C．puzzled; puzzled | D．puzzling; puzzling |
When we heard the funny story, we ___.
| A．were surprised | B．were worried about | C．burst into laughter | D．couldn’t help laughing |
I’d like to ___ my high school days, which were among the happiest in my life.
| A．look forward to | B．look out of | C．look for | D．look back upon |
What ___ the book I put here yesterday?
| A．became of | B．has become of | C．became about | D．has become about |
I was too careless. If only I ___ my car!
| A．hadn’t lost | B．would not have lost | C．didn’t lose | D．haven’t lost |
He was disappointed that his plan did not ___.
| A．go on | B．go off | C．go through | D．go out |