If it ______ rain heavily, the city would have great trouble because of its poordrainage system.
学生常通过调查、采访、研究等______活动获取信息。
Ifit______rainheavily,thecitywouldhavegreattroublebecauseofitspoordrainagesystem.
---What__Amy__?
---She'swritingane-mailtoherpen-friend.
Previewing is a technique of allowing your eyes to travel rapidly ______ a page,stopping here and there to register the main idea.
