After the school party,they gave the classroom a________(打掃) again

2.if she ___(be)free tomorrow,she will come to your birthday party
3.if we take noise in the library,the teacher ___(be) mad at us
4.if you ____(forget) to take your ticket,you can't go into the theater
5.my math teacher___(call) my parents if I ___(fail)the exam once again
6.I don't know if they (take) part in the activity last Sunday
7.我必須換了衣服再去參加聚會(huì)
I must change before I ___ ___ ___ ___.
8.你沒(méi)有什么好抱歉的
 you have nothing to ____ ____ for
9.外面非常冷,讓他進(jìn)來(lái)吧
It's very cold outside.___ him ___.
10.the young girl sang in clubs___ ___ ___(謀生）three years ago