The machine is very easy _______. Anybody can learn to use it in a few minutes.
| A．operating | B．to be operating | C．operated | D．to operate |
I tried to phone her, but even as I _____ she was leaving the building.
| A．phoned | B．would phone | C．had phoned | D．was phoning |
The students _______ busily when Miss Brown went to get a book she _______ in the office.
| A．had written, left | B．were writing, has left | C．had written, had left | D．were writing, had left |
I think you must be mistaken about seeing him at the theatre； I’m sure he ____abroad all week.
| A．is | B．was | C．has been | D．had been |
They haven’t arrived yet but we _____ them at any moment.
| A．are expected | B．have expected | C．are expecting | D．will expect |
I feel sure I _____ her before somewhere.
| A．was to meet | B．have met | C．had met | D．would meet |