Recently I bought an ancient Chinese painting, _________ was very reasonable.
–What has happened to Jack? –He’s had one of his legs _____trying to save a boy from the fire.
You must be aware ______the fact that it is ____ great importance to learn English well.
I won’t give you any help __________ you tell me the truth. It’s none of my business.
Many of my students, __________ Zhang Hua and Li Yong, are working very hard, and we should learn from them.
Of these two teams above, the former comes from the US; the _________ comes from England.