They've kept up a friendship with the teacher whom they were at school _____ twenty years ago.
| A．with | B．about | C．since | D．till |
—I didn’t go to work yesterday because my car broke down.
—You _______ mine.I wasn’t using it then.
| A．might borrow |
| B．could have borrowed |
| C．must have borrowed |
| D．ought to borrow |
Mr Bush is on time for everything. How _______ it be that he was late for the opening ceremony?
| A．can | B．should |
| C．may | D．must |
—Are you coming to Alice’s party?
—I’m not sure.I _______ go to the concert instead.
| A．must | B．would |
| C．should | D．might |
—May I smoke here?
—If you _______, choose a seat in the smoking section.
| A．should | B．could |
| C．may | D．must |
—Can we ski on this mountain?
—Of course.However, at no time _______ you do so alone.
| A．could | B．might |
| C．need | D．must |