--- Why did you leave the fan on in your room? It’s a waste of electricity. ---________
The scientist_______ everyone ______ our environment .
Tim is weak in math, so he is trying _________ up with other students now.
Every student in our calls is looking forward to ______a good future.
I must return the two books to the library. I _____ them for 20 days.
I think these sunglasses make me look ______. What do you think?