--______ a volunteer is great.
-- I think so. Some of us want ______ volunteers for the next Olympics.
| A．Being, being | B．To be, being |
| C．Being, to be | D．To be, to be |
—How often do you chat with your friends online?
—. I'm busy with my study.
| A．Only one month. | B．About twice a month. |
| C．Almost every day. | D．Maybe in two weeks. |
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 |