I didn’t hear the phone. I ___ asleep.
| A．must be | B．must have been |
| C．should be | D．should have been |
I was really anxious about you. You ＿home without a word.
| A．mustn't leave | B．shouldn't have left |
| C．couldn't have left | D．needn't leave |
My sister met him at the Grand Theater yesterday afternoon, so he ＿＿＿＿ your lecture．
| A．couldn't have attended | B．needn't have attended |
| C．mustn't have attended | D．shouldn't have attended |
Sorry I'm late． I ＿＿＿＿＿ have turned off the alarm clock and gone back to sleep again.
| A．might | B．should | C．can | D．will |
I think he’s just going to deal with this problem ____day.
| A．next | B．other | C．following | D．another |
While standing on a moving bus, you’re supposed to hold onto the bar in order not to _____.
| A．in balance | B．keep balance | C．lose balance | D．hold the balance |