Because Robert was seen ____ the room, everyone thought he was the thief.
A. to enter B. enter C. entered
______ has Miss Green taught in your school? For about six years.
A. How long B. How soon C. How far
I hear there will be all kinds of robots________ twenty _____ time .
A. after, years B. in, years’ C. for, year’s
I know Beijing very well since I ________ there three times.
A. have been B. went C. have gone
-- You look very worried. _______? -- My new car hurt an old woman.
A. Can I ask a favour B. How do you do C. What’s up
Tom ______ the book before he took it.
A. looked up B. looked for C. looked through
