14. The book was so interesting that I read it twice.
→The book was

15. The essay is too long. He can’t finish it in 15 minutes.
→He doesn’t have

16. I know a few English words. I can’t read a newspaper in English.
→I don’t know 
17. The children couldn’t go skiing because the sea was very rough.
→The sea was 
18. She couldn’t do this math exercise because it’s extremely difficult.
→This math exercise is 

14. The book was so interesting that I read it twice.
→The book was

15. The essay is too long. He can’t finish it in 15 minutes.
→He doesn’t have ________________________________________________________ 

16. I know a few English words. I can’t read a newspaper in English.
→I don’t know __________________________________________________________________.
17. The children couldn’t go skiing because the sea was very rough.
→The sea was ___________________________________________________________________.
18. She couldn’t do this math exercise because it’s extremely difficult.
→This math exercise is _