16. If you go to the movie tonight, so ______ I .
A. will B. do C. am D. can
17. You don’t know about the difficulty I had ______ the work then at all.
A. done B. to do C. for doing D. in doing
18. ______ is well-known, the environment in China is badly in need of improvement.
A. It B. That C. As D. What
19. Charles Babbage is generally considered ______ the first computers.
A. to invent B. inventing C. to have invented D. having invented
20. With oil prices keeping ______, people are hesitating whether to buy a car or not.
A. rising B. arising C. raising D. arousing
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