-- You know I dropped medicine and __________ physics.
--- You made a right decision.
| A．took up | B．took in | C．took apart | D．took off |
---I called you yesterday. A woman answered, but I didn’t recognize her voice.
----Oh, it _____ my aunt Jean.
| A．must be | B．must have been |
| C．might be | D．can have been |
It’s a very kind offer, but I really _____ accept it.
| A．mustn’t | B．needn’t | C．can’t | D．don’t |
This cake is very sweet. You _________ a lot of sugar in it.
| A．should put | B．could have put | C．might put | D．must have put |
—Catherine, I have cleaned the room for you.
—Thanks. You _________it. I could manage it myself.
| A．needn’t do | B．needn’t have done |
| C．mustn’t do | D．shouldn’t have done |
He paid for a seat, when he _________ have entered free.
| A．could | B．would | C．must | D．need |