41.  How to use them?

42.  Sometimes we go swimming and to skateing .When my parents are busy to work I will help them.

43.  It helps me to solve them.

44.  Secretary of Professor Hunter-Miss Green took them to the professor's room.

45.  At last two policemen came to the professor's house, they were worried, they told him the true story, The professor asked them not to worry about his invention.

46.  Most of them are good swimmers.

47.  Now, I hope very much that I can see them again.I still remember that day which I first came to school.

48.  He needed them for his revolutionary work.

49.  When I was a Junior middle school student, my poorents work very far from me , so I had to live at school, I could see them only one time each month , I felt very lonely, it's too hard for me .

50.  The clothes were tom and there was blood on them."