the children have fun, parents can take dance lessons on the beach.
| A．When | B．If | C．While | D．Once |
The World Health Organization has given some advice onto protect us from being infected(感染） with H7N9.
| A．how | B．what | C．where | D．when |
—Linda, I called you this morning, but nobody answered the phone.
—I'm sorry. I football with my friends then.
| A．play | B．played | C．am playing | D．was playing |
—Why do you collect so many old bikes?
—I'Il have them _ and give away to the children who don't have bikes.
| A．used up | B．given up | C．fixed up | D．set up |
—Can we run across the road now?
—No, we _. We have to wait until the light turns green.
| A．needn't | B．mustn't | C．couldn't | D．shouldn't |