It’s nearly seven o’clock. Jack ________ be here at any moment.

_________ you _________ stay up late to finish your homework— Of course not. I _________ go to bed early. So I should plan my time wisely.

It is ________ the customers’ needs that has made chain stores so popular in big cities in China.

Peter! How are you getting on with your studies?—Well, my grades have gone down, not too much, but _____ to make my mom disappointed [ ]

Experiments of this kindin both the U．S．and Europe well before the Second World War