—You seem to be familiar with London.
—I ______ there for three years. It’s great to be back again.
| A．had lived | B．lived |
| C．have lived | D．live |
--- Could you be so kind as to close the window?
--- ______.
| A．With pleasure | B．Go ahead | C．Yes, please | D．That's nice of you |
— We did not see him at the lecture yesterday．
— You ______ him, since I went to an international conference with him．
| A．mustn’t have seen | B．can’t have seen |
| C．couldn’t see | D．needn’t have seen |
The roof began to fall ______ she had time to dash into the room to save her baby.
| A．after | B．as | C．before | D．until |
Don’t be so discouraged. If you ______ such feelings, you will do better next time.
| A．carry on | B．get back | C．break down | D．put away |
No such authorization ______ be given without the president’s written permission.
| A．should | B．shall | C．would | D．may |