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

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.