单词拼写。

根据下列句子及所给汉语注释，写出空缺处各单词的正确形式，每空只写一词。

1. The exercises are designed to ________ (增强) your stomach muscle.

2. Don't be frightened by the television camera. Just speak         (自然地).

3. The boy spoke in a low voice        (承认)that it was his fault.

4. Are you well __________(准备) for the entrance examination?

5. As the storm drew near, black clouds were __________ (聚集) over the sky.

6. However, his __________ (知识) of French remained very weak.

7.          (令人吃惊的是) , some graduates with qualification failed to find jobs.

8. The Bank of China has a lot of __________ (支行) in the world.

9. This kind of tree can only grow in the __________ (北方) parts of China.

10. Nuclear physics is ________(超出) my understanding.