1.The old woman waited _____,but her son didn't come back.
a.day after day b.day to day
2.I was taking a ___ when the telephone rang.
a.walk b.rest c.heavy rain d.bath
疑惑:但我认为a,b,c都看上去很对的,疑惑中~
3.We ____ stay in the classroom ___Mr Wang comes back.
a.will until b.won't until
疑惑:不是not^^^^until^^^吗,那正确答案为什么是A啊 /
4.In the last three years great changes____ in our school.
a.took place b.had taken place
c.have taken place d.have been taken place
5.I ___know you __here.
a.don't are b.didn't were
疑惑：不用选a ,很纳闷~,有谁知道?
6.the teacher ____in charge of a class___ a class teacher.
a.is is b./ is
c.to be is d.is to be
疑惑：看什么都对,可答案只有一个,说说理由阿~