The policeman kept his eyes________on the screen of the computer to identify the criminal's footprints.
| A．fixing | B．fixed | C．to fix | D．being fixed |
In China,_____ bus is _____ popular means of transportation.
| A．the; a | B．a; / | C．the; the | D．a; the |
Henry _____ be at home now because he phoned me from the factory just now.
| A．mustn’t | B．isn’t able to | C．may not | D．can’t |
-----Will you attend tomorrow’s meeting?
-----No, _____ I am invited, I will not go there.
| A．even though | B．if | C．unless | D．because |
-----Oh, it’s you. I _____ you.
-----I’ve just have my hair cut and I’m wearing sun glasses.
| A．didn’t recognize | B．hadn’t recognized | C．haven’t recognized | D．don’t recognize |
Mrs. Smith has three sons, two _____ have gone to college.
| A．of them | B．of whom | C．of who | D．of which |