⑴____ A.photo       B. box         C. clock        D. lost

⑵____ A. thank       B. think      C. thing         D. brother

⑶____ A. brown    B. know        C. now        D. how

⑷____ A. food      B. good       C. school       D. room

⑸____ A. blue      B. bus         C. lunch        D. number

在“光对鼠妇生活的影响”的探究实验中，单一变量是（　　）

阅读下面短文，从方框中选出适当的词，并用其正确的形式填空，使短文意思完整。每词限用一次。

   It’s very important for everyone to protect the environment. As a student, I always try my ____  to save energy at home. I turn off ____  when I don’t need them. And I try to save water when I wash the dishes. I don’t ____  bottles or newspaper away because it’s better to recycle them.
   I think everyday activities at home can make a difference to the environment. I feel proud of ____, and I will not only keep saving energy but also advise others to do the same things as me. If everyone cares about ____  the environment, I’m sure we’ll have a better life.