Excuse me. I _________ I was in your way.
A. didn't realize B. don't realize
C. haven't realized D. wasn't realizing
---Could you please come to the museum with me this afternoon?
---Sorry， I ______ . I have to take a piano lesson at 2 pm.
A.couldn’t B. mustn’t
C. can’t D. needn’t
---You never have sweet snacks， do you?
---________. Though I know they’re bad for our health.
A. Yes B. No C. Yes， I don’t D. No， I do
I _____ the book for two weeks. I must return it to the school library.
A. borrow B. have borrowed
C. kept D. have kept
---What do you think of the environment in our city?
--- I am sure it _________ greatly through our work in the near future.
A. improved B. was improved
C. has improved D. will be improved
--- Can a plane fly _______ the Atlantic Ocean(大西洋)?
---Yes， but it needs to go _______ the clouds for hours.
A. across， through B. through， across
C. across， across D. through， through
