1、答案:had an advantage over the rest of us
解析:1)词组:have an advantage of(比…有利)
2)时态:根据前半句的knew,此处应使用一般过去时
2、答案:make sure the books (should) be returned in time
解析:1)从句:主语从句it is important that …
2)虚拟语气:此处主语从句应使用should + 动词原形,should可以省略
3)语态:此处“按时归还”应使用被动语态be returned
4)词组:make sure(确认)
3、答案:come/go into effect
解析:词组:come/go into effect(生效)
4、答案:go in for teaching
解析:词组:go in for(从事)
5、答案:reducing the strain of cultural shock
解析:1)动名词:assist somebody in doing something
2)词组:cultural shock(文化冲击)