用is, am或are填空。 

1. Excuse me. What ____ this in English?

2. — ____ this your coat, Mr. Green?

    — No, it ____ not.

3. What ____ these? ____ they maps?

4. This ____ your bike. Where ____ my bike?

5. I ____  in Class Eleven. What class __     you in?

applet显示相关的3个方法是：paint()方法、update()方法和 【14】 。