I’m surprised to see you are a chain smoker. You _______ , I remember.
| A．didn’t use to be | B．mustn’t | C．used not to | D．didn’t have to |
You just can’t imagine what a bad impression some Chinese left _____foreigners while travelling abroad, so it is necessary to impress _____ people the importance of good manners.
A. on, to B. on, on C. to, on. D, to , to
______ is even more important is ______ as the earth cooled down, water began to appear on its surface.
A. What, that B. That, what C, That, that D. What, what
After the new technique was introduced, the factory produced ________ cars in 2009 as the year before.
| A．as twice more | B．as many twice | C．more than twice as many | D．twice more than as |
Rather than ______ the plane all the way, they decided _______ to Vancouver.
| A．taking, flying | B．take, to flying | C．take, to fly | D．to take, to fly |
He has no money nor friends here. That’s why he ______ sleep in the street.
| A．must | B．has to | C．should | D．may |