We must protect plants. They are friends of ______.

— Can I use your notebook computer this afternoon? ________ is under repair.— No problem. 

The room was dark，_________ I turned on the lights．

— This book on idioms is interesting. I’d like        , where did you buy it, Simon?—In the Amazon Bookstore,

 Don't copy others' work. If you do it by        , you'll feel much better.