—— I'm sorry I can't help you. —— ________. A. Not at all. B. You are welcome. C. It doesn't matter.
There are books in our library. A. many and manyB. more and more C. some and some
We should not cuttrees. A. off B. upC. down
The weather is gettingin August. A. more hot B. hoterC. hotter
Trees can keepcool. A. usB. weC. our
We need more trees. A. plantB. to plantC. planting