—Do you know who knocked at our door last night, the postman?
—It _______ him. It was only 5 o’clock.
| A．mustn’t | B．can’t have been |
| C．can’t | D．mustn’t have been |
The manager showed the new employee ______ to find the supplies.
| A．what | B．where | C．that | D．which |
If the machine should ______, call this number immediately.
| A．break down | B．set out | C．put on | D．go up |
Never ______ such a good boss before I came to this company.
| A．do I meet | B．I met | C．had I met | D．I had met |
This article is well written because special attention ______ to the choice of words nod style of writing.
| A．had been paid | B．has been paid | C．will be paid | D．will have been paid |
Sorry, we cannot ______ you the job because you don't have any work experience.
| A．make | B．send | C．offer | D．prepare |