1. —Your phone number again? I _______ quite catch it.
—It’s 9568442.
A. didn’t B. couldn’t C. don’t D. can’t
2. —Can I help you, sir?
—Yes. I bought this radio here yesterday, but it _______.
A. didn’t work B. won’t work C. can’t work D. doesn’t work
3. Helen _______ her keys in the office so she had to wait until her husband _______ home.
A. has left; comes B. left; had come
C. had left; came D. had left; would come
