17. The fact that/which she works hard is well known to us all.

16. Whether/If his dream of going to college will come true is uncertain.

15. When the summer holiday comes, thousands / thousand of people will travel to the seaside to have a swim in the sea.

14. Because of his poor English, it was difficult for him to figure/ think out what the foreigner really meant.

13. Do you still remember the first news which/that he told us at the meeting?

12. The students are excited at the news as/that they will have a three-day holiday.

11. China is large in/on area and has a long history.

10. My father has taken/been on a business trip for a week.

9．　 The difficulty they have settling down/to settle down is not easy to overcome

8．　 So long as/ As far as I know, Class 8 have already learned the text.