The teacher talked in a very low voice_____make himself________, clearly.
| A．in order to; hear | B．so as not; hear |
| C．in order not to; heard | D．so that to; heard |
I posted a book to her three weeks ago. She________have received it.
| A．must |
| B．should |
| C．might |
| D．could |
She________have been to your house. She doesn't know your address.
| A．mustn't |
| B．shouldn't |
| C．might not |
| D．can't |
—I'm sorry, Mrs Smith. I've broken your glasses.
—It doesn't matter, Marks, but you________careful.
| A．must be |
| B．should be |
| C．must have been |
| D．should have been |
I can't find the recorder in the room. It________by somebody.
| A．may have been taken away |
| B．may leave |
| C．may take away |
| D．must have taken away |
—Why was Alice late for her meeting yesterday?
—She________the first early bus.
| A．must have come |
| B．may miss |
| C．should have missed |
| D．might have missed |