While watching television，____ ．
| A．the doorbell rang | B．the doorbell rings |
| C．we heard the doorbell ring | D．we heard the doorbell rings |
— What’s the matter with Peter?
— He was seen crying when he was coming out of the office．He ________ by the manager．
| A．may be scolded | B．should have been scolded |
| C．must be scolded | D．must have been scolded |
— It _______ be Mr．Johnson who is in the office．
— No, it _______ be him．I saw him off at the airport half an hour ago．
| A．can’t ; can’t | B．must; can’t | C．must; mustn’t | D．may; mustn’t |
--Was the test hard?
--The test was so hard that he ________ failed．
| A．almost | B．most | C．mostly | D．hardly |
The computer is ________ to be one of the greatest inventions of the 20th century．
| A．considered | B．regarded | C．expected | D．suggested |
The seller would sell the shirt for ten yuan, but the customer ________ eight yuan．
| A．sold | B．offered | C．charged | D．asked |