1. (2021·温州模拟) 用方框中所给单词的适当形式填空。每词限用一次。

energy   twenty  among  serious  warn

1. （1） Shakespeare's works were popularcommon people in his day.
3. （2） Michael Phelps, a great swimmer, got hisgold medal in London Olympics.
5. （3） Food waste is seen as one ofsocial problems in many countries nowadays.
7. （4） Signs have been put on all public bikespeople not to carry children on the baskets.
9. （5） A lot of research show that the production of paper products requires moreand water.