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20. ---- It looks heavy. Can I give you a hand.　 ----- _________

　 A. Yes, I do.　 B. Yes, my pleasure　 C, No, never mind　　 D. No, thanks.

19. ---- I am sorry, I _______ at you the other day.

　 ---- Forget it. I was a bit out of control myself.

A. shouldn’t shout　 B shouldn’t have shouted　 C. mustn’t shout　　 D. mustn’t have shouted

18. It’s on the festival occasions ______ the family get together ________ he misses his late father.

　 A. where, that　　 B. which, when　　 C. when, that　　 D. that, when