— According to my grandma, it is a good idea to eat chicken soup when you have a cold.— ________, scientists agree with her.

—Why are you so late?—I was in half the way when it______to me that I had left my notebook home，so I had to fetch it.

——He ought ot have been warned of the danger.——____, but he wouldn’t listen to me.

If you don’t study hard, you’ll regret, _____ you?

John thinks it would be long ________ he is ready for his new job.