It could be learned from the teacher’s eyes ________ he was very satisfied with her performance

Scientists are trying their best to _______ways to treat the terrible disease called H7N9.

Can I really get a mountain bicycle as a reward if Iwin the race —Absolutely! .

Let’s go to see the show. —I _____ it. It’s very interesting.

Must I return the book today— No, you ________. You can do it tomorrow.