— Where did they go ________ vacation?—They went to Shanghai.
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.