Is______necessary to change trains at Beijing?

----- Have you informed Tom and Ann that some foreign experts will visit our company at 8:00 tomorrow morning? ------ Yes, I have. But_____ of them asked me to tell you that they would not be able to come. 

(2013·石家庄第二次质量检测)I don't believe you can do today's job with yesterday's methods and be in tomorrow's business, ________？

For quite a few students, their teacher’s advice is more important than _________ of their parents.

 —Do you have ________ at home now, mum?—No, we still have to get some fruits and vegetables.