21. —.Tom, you didn’t come to the party last night?
— I _____ , but I suddenly remembered I had homework to do.
A. had to B. didn’t C. was going to D. wouldn’t
22. William will keep you _____ if you don’t want to be lonely.
A. company B. companion C. accompany D. companied
23. When the cheering _____ , the president continued his speech.
A. died off B. died down C. died out D. died of
