He ________ whether he will be able to win the tennis match. So he feels very nervous.
Stop ______ a noise in the library .The students are reading books .
There are a lot of people in the park last Sunday. We had ______ to take a rest, so we got tired.
—Did you see a boy in blue pass by just now? —No, sir. I ______ a magazine.
—What does the symbol “<” mean? —It means “______”.
We think Betty the best student. The sentence structure is ______.