【2013山东潍坊】I have two sisters, but_________of them is a teacher.
We should try to prevent air pollution__________.
---He didn’t catch the train, did he? -- _________, because he was caught in the rain.
The book is________ interesting________ I can’t even drop it for a minute.
---I am very worried about tomorrow’s math test. I am afraid I can’t pass this time. --___________! I’m sure you’ll be successful.
---I wonder if it is going to rain next week. ---If it_________, I have to stay at home.