Mary is the only one of the students in our class who ____ to the Great Wall so far.
| A．is | B．has been | C．are | D．had been |
______ our horizons of thinking, but it also saves us time and energy.
| A．Not only does the Internet expand | B．Not only expands the Internet |
| C．Not only the Internet expands | D．Not only the Internet does expand |
An excellent way to help memory is to connect information with pictures, which ______ as a memory-link method.
| A．considers | B．is considering | C．is considered | D．Considered |
Air bags for cars were invented _____ lives. Without them more people would be injured in car accidents.
| A．saving | B．saved | C．to save | D．to have saved |
Last year John earned _______ his brother did, who has a better position in a bigger company.
| A．twice as many as | B．twice as much as |
| C．twice as more as | D．twice much as |
With his good sense of direction, he _____ quickly and easily get round in the new city.
| A．can | B．must | C．should | D．need |