When H7N9 bird flu first appeared, people didn't know_______ doctors could cure it.
| A．if | B．that | C．what | D．why |
It is terrible. The cat miaowed a lot at night recently. It _________ a baby crying.
| A．sound | B．sounds |
| C．sound like | D．sounds like |
In spring, it is good for you to sleep ________your windows open.
| A．for | B．to | C．with | D．about |
The students are _______ to know that elephants can walk quietly on tiptoe.
| A．surprising | B．surprised |
| C．frightening | D．frightened |
In spring, you will _______ the whisper of the breeze(清风)，if you _______ carefully.
| A．hear, listen | B．listen, hear |
| C．hear, listen to | D．listen to, hear |
—____ girl in red is Millie 。
—Oh， What ___ nice girl!
| A．The / | B．A a | C．The a | D．A / |