摘要：Do you have any hobbies? If we don’t have any 10． except schoolwork.we may become boring people．And that can influence our studies.Studying without relaxing isn’t 11 for health．We can’t get goodgrades if we have bad health．We should make use of our free time．We should do
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Of all the inventions, what do you think is ________ invention in the 21st century．
- A.the most helpful
- B.more helpful
- C.helpful
- D.more and more helpful