一份完整的综合试卷，无听力，有答案。难易适中。
1. The early train is _________ to leave at 6:00 in the morning. You’d better get to the station
________5:30 at the latest.
A. due; by B. possible; at C. sure; around D. probable; beyond
2. Scientists are convinced
_____ the positive effect of laughter _____ physical and mental health.
A. of; at B. by; in C. of; on D. on; at
3. Kathy ______ some French while she was away on a business trip in France.
A. picked up B. took up C. made up D. turned up
