You shouldn’t talk until ________ to.
| A．asking | B．having asked | C．to ask | D．asked |
—Jim is very sick these days. He coughs so badly.
—In my opinion, he really ________ listen to the doctor and cut down on smoking.
| A．should | B．can |
| C．may | D．need |
—Where did you get this book?
—I picked it up from a secondhand bookshop if you ________ know.
| A．must | B．will |
| C．can | D．shall |
When Harry was at college, he ________ go to the reading room after supper every day.
| A．should | B．might |
| C．would | D．could |
Don't be angry with us. We ________ with you together, but we were busy with our final reports when you called in.
| A．would eat out | B．must have eaten out |
| C．should eat out | D．could have eaten out |
Your teacher ________ very angry at that moment because you talked back to her like that.
| A．should have been | B．must have been |
| C．must be | D．might have been |