20. —Who is the girl talking to the headmaster?
—Oh, _______ is Betty, the president of Stud ent Council.
A. she B. he C. it D. her
21. We always visit the old people’s home _______9 a.m. on Sundays.
A. in B. at C. to D. on
22.Mr. White couldn’t get any news about his missing daughter, ________ he was very worried.
A. but B. for C. or D. so
23.— Can you speak Japanese? — No, I ______.
A. can’t B. shouldn’t C. mustn’t D. needn’t
