1．It was raining when we arrived at the foot of the mountain .
2．When I was on the edge of the Grand Canyon , I think it’s one of the wonders of the natural world .
3．After walking about a kilometer , a stranger appeared in front of me .
4．If he works hard , he will get good grades .
5．Did you watch TV last night ?
6．Tom has made great progress in English this term .
7．When we arrived , the students gave us a warm welcome .
8．As a student, we should study hard .
9．I’m very pleased to listen to the concert tonight .
10. Who paid for the things you bought ?
11. Don’t give up if you want to keep fit .
12. His ideas have changed school dinners all over Britain.
13. I’ve know him ever since he was a child .
14. Mike thinks eating junk food is bad for his health .
15. We should ban students form using mobile phones at school.
