瑞雪是几月:英语改错 HELP

1.how often do you hear from your brother’s letter？
2.why are you in such hurry？we hace plenty of time。
3.it’s said that ordinary people will be able to travel to the moon infuture。
4.Jimmy ran out of the classroom and knocked a teacher。
5.they overcame one difficulty after the other and finally succeeded in the experiment。
6.Please don’t lose your heart when you are in trouble。
7.you’d better raise your voice a little so that you can make yourself hear。
8.I often hear this song on radio。
9.you should pay attention to your teacher in the class。
10.The Browns are on the holiday these days。
11.I’m sorry that I didn’t reply your e-mail until last Sunday。
12.more than 50 students were sent out because the lecture hal was full。
13.as a great scientist，Isaac Newton looked at things from different ways。