—Look! The lights in the teachers’ office are still on. Is Mr. Li working?
—No. It _______ be Mr. Li. I saw him leave just now.
| A．may not | B．mustn’t | C．can’t | D．needn’t |
Mary didn’t go to John’s birthday party because she ________.
A. wasn’t invitedB. didn’t invite C. isn’t invited
Tony wants _______a job as a language teacher in China.
A. to find B. finding C. find
—Do you know ________ she went to the movie last night?
—On foot.
A. when B. why C. how
—Let’s go dancing tonight.!
—Sorry, I ________.I have to go to my guitar lesson.
A. mustn’t B. needn’tC. can’t
Listen! Someone _________ for help!
A. called B. is calling C. has called