根据句意，用括号内所给单词的适当形式填空。

1. Mr Li is talented and _____ (energy) so that we all like him.

2. The actors in the film didn’t act very well . And the actress acted even _____.(badly)

3. He answered the question _____ (correct) so Mr Wu was very angry with him.

4. The twin brothers like looking at _____ (they) in the mirrors.

5. Don’t worry! Your problem is still under _____ (discuss).

对有色金属腐蚀最厉害的有害气体是（）。

A、二氧化碳

B、二氧化硫

C、硫化氢

D、氧气