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Unit17_18基础练习

一.选出最佳答案

1. In washing this cloth, be sure to _______ the temperature of water.

   A. allow for          B. pay for       C. account for          D. answer for

2. One of the provinces _______ the union and formed a new country.

   A. broke away from            B. kept away from 

C. did away with                 D. cut off

3. It is well known that Thomas Edison _______ the electric lamp.

   A. invented                     B. discovered

   C. found                      D. developed

4. In order to get the exact result, the scientists made _______.

   A. a lot tries                        B. to do experiments