Fill in the blanks with the proper forms.(用所给单词的适当形式填空。)

1. Look! The tiger is _______ (swim) .

2. I can _______ (make) a snowman.

3. Everyone _______ (like) to get birthday cards.

4. I usually _______  (go) home at 5 o'clock in the afternoon.

5. I'm _______ (clean)the room now.

6. — _______ you ______ (eat) breakfast at 7:00 every day?

    — Yes, I do.

7. When is ______ (you) birthday?

8. There are some _______ (sheep)on that farm.

9. They _______ (be) playing football together.

10. I like _______ (read) books.

白细胞黏附缺陷症（）。

A.CD34

B.CD117

C.两者都有

D.两者都无