1 . Although they have been   ________for two hours, they haven’t reached an agreement on whether to go camping by train or by car.

A．complaining

B．considering

C．arguing

D．explaining

3 . 根据句意，选择单词并以其适当形式填空。

1. Destruction of the environment is one of the most serious ______ we face.
2. Usually a child’s behavior is a ______ of his family environment.
3. The price of wine varies ______ depending on where it comes from.
4. With the exam ______, I find myself working harder than ever before.
5. He spent the evening ______ up Christmas presents.
6. Students should establish an ______ of environmental protection.
7. They ignored the ______ time and were late for the meeting.
8. The shop is small, but it offers a ______ of nice goods.
9. I ______ her to think twice before she makes a decision.
10. Betty ______ to Steve that Sara never gave her a chance to talk.