---I didn’t expect the job would be so hard.
---You _________ of that earlier.
| A．must think | B．ought to think |
| C．should have thought | D．must have thought |
— What does the sign over there read?
—“No person __________ smoke or carry a lighted cigarette，cigar or pipe in this area.”
| A．will | B．may |
| C．shall | D．must |
I told your friend how to get to the hotel, but perhaps I __________ have driven her there.
| A．could | B．must |
| C．might | D．should |
—How’s your tour around the North Lake? Is it beautiful?
—It __________ be, but it is now heavily polluted.
| A．will | B．would |
| C．should | D．must |
—Where is my dictionary? I remember I put it here yesterday.
—You __________ it in the wrong place.
| A．must put | B．should have put |
| C．might put | D．might have put |
— She looks very happy. She __________ have passed the exam.
— I guess so. It’s not difficult after all.
| A．should | B．could |
| C．must | D．might |