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请用适当形式填空 enjoy,care,reuse,waste,eat,hope,environment,help,ph

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请用适当形式填空 enjoy,care,reuse,waste,eat,hope,environment,help,physics,harm
1.when we are visiting a museum ,we must be_about the exhibits on display.
2.Most of the machines are_because they are made of metal.
3.our science teacher is so _that he always helps us out when we are in trouble
4.The trip to Hainan was really_.we enjoyed ourselves a lot during the journey.
5.It is_to ues the textbooks only once a year.
6.Each school should pay more attention to the_education of protecting the world.
7.P.E.is short for_ education.It is an important subject in middle schools .
8.The little boy walked so_that he fell down and hurt himself badly.
9.Electricity is called “green energy”.It is_to our environment.
10.Not all the mushrooms are _,so you ’d better be careful before cooking.
1、harmless
2、reusable
3、hopeful
4、enjoyable
5、wasteful
6、environmental
7、physical
8、careless
9、helpful
10、eatable