单选题 It's normal to spend two or three years working in one's own country before working______.

单选题 We all know that Chinese is our______language.

单选题 He had a______to his wife who gave him the money to start his business.

单选题 Changes were taking place, though at the time no one fully______how important these changes were to be.

单选题 Children learn by watching their parents, in______to asking questions.

单选题 All the parents are happy that the school______its students with a free lunch.

单选题 They agreed to meet the______week in the People's Park.

单选题 If you have sleep trouble, a doctor can help you______out why it's happening.