—Everybody says you are a good student，you never fall asleep in class，do you？
—_____ ．
| A．Yes，sometimes | B．No，I did | C．Yes，never | D．Yes，I didn't |
______ , the players began the game.
| A．Having taken our seats | B．Taking our seats |
| C．Being taken the seats | D．After we had taken our seats |
— I phoned you yesterday morning. A girl answered, but I didn’t recognize the voice.
— Oh, it ____ my younger sister. She was in my room at that moment.
| A．must have been | B．should have been | C．could have been | D．may have been |
The old woman who______in the deserted house alone for ten years has been settled in a nursing home now.
| A．lived | B．has lived | C．had lived | D．has been living |
The new buyer identified a dozen new sources for the material, ___________ proved to be reliable．
| A．most of them | B．most of which | C．most of whom | D．most of those |
_____ I say Clancy is a smart boy, he still needs to work hard to achieve his goal.
| A．Then | B．When | C．While | D．As |