1.  This week, it's our turn to sweep the school , On Monday, we went to school at 6:45, the sky was too black, and the street had nobody, we started working , the ground had many leaves , It took times for us to carry he eaves .

2.  It is only two months for us to have the exam.

3.  But on the Thursday, I must fill in a member for .

4.  It is also helpful for us to improve our spoken English.

5.  It was helpful for us to answer question in class.

6.  There was no time for me to ask her her name and which school she was in.

7.  There was no time for me to ask her name and which school she was in.

8.  I'm afraid that it is bad for his health to be angry .

9.  I think you must say "yes ", because this song is very popular and common on birthday and it's easy for us to sing.

10.  at least you mustn't change your mind at your pleasure if something unexpected really prevents you from coming, you must tell the host or hostess about it several days before the dinner for at that time the host or hostess must have begun to go shopping and prepare for the dinner it is always considered impolite to tell the host or hostess that you are not able to came at the last minute .