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课时提升作业(三十六)
选修8 Unit 5
Ⅰ. 单项填空
1. Scientists say that there will be an resource if water in the world has been used up one day.
A. appropriate B. alternative
C. approximate D. another
2. (2013·南阳模拟)We hard together to achieve our common goal these years—to build a cleaner, safer and healthier world.
A. have been working B. are working
C. work D. have worked
3. (2013·阜阳模拟)—What’s your feeling now?
—I am terribly sorry. If only I here yesterday!
A. came B. would have come
C. have come D. had come
