Historical experience can as a most important source of information.
| A．serve | B．use | C．regard | D．prove |
It’s extremely dangerous for the drivers to _______ speed as the traffic lights are changing．
| A．pull up | B．put up | C．rise up | D．pick up |
Writing out all the invitations by hand was more time-consuming than we______.
| A．will expect | B．are expecting | C．expect | D．had expected |
China's reform and opening has been going on for ________ is like about 30 years now and it's really quite remarkable.
| A．that | B．which | C．what | D．it |
There is ______ word in the dictionary.
| A．no such | B．not a such | C．no such a | D．not such |
After many years of hard work，the man has finally reached the stage________he has gained good fortune and social status.
| A．where | B．that | C．which | D．why |