When he saw a wallet on the playground , he at once . A. picked it up B. gave it up. C. picked up it.
—Why didn't you come and buy the new book with me yesterday?—Sorry, I ______ at that moment.
—Do you like watching The Voice of China on TV?—Sure. It's nice. But I ______ Sports News.
All the countries agreed to ______ an organization to help those kids left homeless in the earthquake.
To be a police officer is great. We know that police officers' work is kind of dangerous ______ exciting.
You will know how cool it is to achieve your dream ______ your own hard work.