It is worth considering what makes “convenience” foods so popular，and ________ better ones of your own.
| A．introduces |
| B．to introduce |
| C．introducing |
| D．introduced |
More and more fast-food restaurants have ________ all over the town in the last few years.
| A．picked up | B．taken up | C．sprung up | D．put up |
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 |