PART TWO LANGUAGE KNOWLEDGE （15 points）
Directions: Beneath each of the following sentences there are 4 choices marked A, B, C and D. Choose the one answer that best completes the sentence.
21. _______ more of your family’s company even if you are as busy as a bee.
A. Enjoy B. To enjoy C. Enjoying D. Enjoyed
22. I have been playing tennis every day and I really don’t understand _______I am not losing weight.
A. how B. what C. when D. why
23. If you ______ the chat room ten minutes ago, you would have known what they were talking about.
A. should join B. joined C. had joined D. have joined
24. After the flood, there was mud and water everywhere, _______it difficult to travel from place to place.
A. make B. making C. to make D. made
25. My most vivid and happiest memories are those of the school days, _______ I often had the encouragement
