单项选择题
Professor Smith promised to look（）my paper, that is, to read it carefully before the defence.
A.on B.after C.into D.over
单项选择题 It's our duty to preserve the planet for future（）
单项选择题 I don't think I will ever feel（）spreading rumors.
单项选择题 If you're coming, please let me know（）advance.
