1. 根据句意及汉语提示完成单词。

1. （1） Mona  (插) her chopsticks into the potato just now.

3. （2） My friend Jim is from Australia and he is an  (交换) student in our school.

5. （3） Food, clothing and shelter are all  (基本的) necessities of life.
   

7. （4） How to  (表现) at the table in France is really a problem.

9. （5） The (十几岁的) girl is Tim's sister.