用所给词的正确形式填空。

1. September 1 is the _______ (one) day of our new term.

2. The boy often goes to the library to read _______ (story).

3. She usually _______ (watch) TV on Saturday evening.

4. He doesn't _______ (do) his homework every day.

5. Ms. Lin _______ (be) never late for class.

6. Look, he is _______ (put) on his shoes, he wants to play sports.

7. Kangkang usually _______ (have) breakfast at home, but sometimes in a restaurant.

8. Listen, they are _______ (read) in the classroom.

9. Today is Sunday. Some boys are _______ (fly) in the park.

10. We often take exercise after school, but today we are _______ (play) the piano.

金属汕罐上可调节罐内油气压力，使油罐始终与大气压保持恒定状态的阀门是（）。

A．呼吸阀

B．安全阀

C．截止阀

D．闸阀