18. The person sitting /sat on the sofa was a friend of my brother.

17. He hurried to the station, only to find/ finding the 9:30 train had already left.

16. He was surfing the Internet when/while the electricity was cut off.

15. They have built a highway leading/lead into the mountains.

14. A trained dog can act for/as a guide to a blind person.

13. A new factory will be built in Shanghai, which will provide/ offer more jobs to the graduates.

12. Look through / into this novel and tell me what you think of it.

11. I hadn’t seen her for 30 years, but I recognized/ knew him the moment I saw him.

10.When speaking English, you should be sure to make yourself understand/ understood.

9. It is many/great fun to play table tennis