21.The most attractive ________ in the sports meeting was the gymnastic competition.

   A. thing          B. matter        C. accident        D. event

22. He pretends ______ familiar with me , but I really don’t know him.

   A. be             B. being        C. to be           D. have been

23. I have decided to ________ smoking and drinking.

   A. cut across       B. cut out       C. cut down       D. cut up

24. Sometimes your weakness can become your _______ .

   A. strength        B. short         C. force           D. long