(2013·湖南，35)Not once________to Michael that he could one day become a top student in his class.

I think I’ll give Bob a ring.— You ______.You haven’t been in touch with him for ages.[ ]

The price of oil has _________ sharply to $12 a barrel.

Cheese is made _______milk.—Yes, and it’s eaten _______ many people every day.

_____ all the demands had been refused _____ to go on strike.