考点演练
一、用方框中所给词的适当形式完成句子。
　
1. — How long will the discussion last?
　　　— ____________ we reach agreement.
2. I'm strongly against ____________ because it may cause cancer.
3. Driving after drinking wine is ____________ the law in China.
4. The railway ____________ the east of the country.
5. The little boy rested for a while, and then continued ____________ his book.

一、1. Until 2. smoking 3. against 4. opened up 5. reading/to read