用所给词的适当形式填空。  

1. The red skin is            (small) than the blue one.

2. She _____ (go) to the cinema with her classmates tomorrow evening.

3. It's Children's Day. All the students are very ___     (excite).

4. Your classroom is on the             (four) floor (层). 

5. She wants          _ (buy) a new pen.

6. It often             (rain) in summer.

7. Sometimes they       _    (not have) lunch at home.

8. Look! The bus ___ __ (come).

9. He          _ (make) many cakes for his friends yesterday.

10.             (be) there any tea in the cup?

在三角形连接的对称电源或负载中，线电压等于 倍相电压。（ ）