________ in Tibet for ten years, he has been accustomed to the life and the climate there.
| A．He has worked | B．Having worked |
| C．He has been working | D．Working |
— 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 |
Hardly _____ when the train suddenly pulled away．
| A．did they get to the station | B．had they got to the station |
| C．they got to the station | D．they had got to the station |