He must _____ his sister with her math.
| A．try help | B．trying to help |
| C．tries to help | D．try to help |
—Must I wait for you here?
—No, you ______.
| A．don't | B．can't | C．mustn’t | D．needn’t |
Mary, put on your coat, ______ you'll catch a cold.
| A．and | B．or | C．so | D．but |
We know that she enjoys ______ books very much.
| A．read | B．reads | C．reading | D．to read |
I am very thirsty. Could you please give me ______ water?
| A．some | B．little | C．many | D．other |
—Listen! Someone is playing ______ piano.
—Wow! ______beautiful music! I like it very much
| A．a; what | B．an; How | C．the; What | D．/; How |