---Bad luck! I ________ the sidewalk when an Audi cut in and knocked me down.
---You can never be too careful!
| A．crossed | B．have crossed |
| C．was crossing | D．had been crossing |
Computers in offices and homes since 1970s．
| A．have been used | B．had been used | C．was | D．has been used |
---The window is dirty.
----I know. It ______ for weeks.
| A．hasn’t cleaned | B．didn’t clean |
| C．wasn’t cleaned | D．hasn’t been cleaned |
—Who do you guess I am?
—Sorry, your name _____my mind.
| A．slipped | B．has slipped | C．was slipped | D．slips |
—Ann is in hospital.
—Oh, really? I know. I go and visit her.
| A．didn’t; am going to | B．don’t; would |
| C．don’t; will | D．didn’t; will |
Mary, stop to have a rest. You _________ the flowers in your garden for nearly two hours.
| A．are watering | B．were watering |
| C．water | D．have been watering |
--- What’s that noise?
--- Oh, my God! I ________ to turn the tap off after I brushed my teeth.
| A．forget | B．forgot |
| C．was forgetting | D．had forgotten |
We missed the beginning of the football match. When we got to the stadium, the match ______.
| A．would start | B．has started |
| C．had started | D．was starting |
Hurry up. I_____ for Korea to visit my uncle; The plane_____ at 10:00.
| A．am leaving; will leave |
| B．leaves; is leaving |
| C．am leaving; leaves |
| D．will leave; is leaving |
John ______ in his room when he heard screaming.
| A．is studying | B．studied | C．was studying | D．has studied |