Grace thinks _________ is the best way __________．
| A．exercise, relax | B．to exercise, relaxing |
| C．exercising, to relax | D．exercising, relax |
Which sign represents the meaning of saving water?
A． |
B． |
C． |
D． |
—You are late. The meeting _________ for about ten minutes.—I’m sorry. The traffic is heavy.
| A．has begun | B．began |
| C．has been on | D．have been |
The high-speed railway linking Zhengzhou in Henan province to the western city of Xi'an in Shanxi province, started __________ January 17, 2010.
| A．in | B．for | C．on | D．since |
—Please remember _________water pipe when you don’t need water. —OK, I will.
| A．to turn off | B．turning off |
| C．to turn on | D．turning on |
______ information he offered us! We all thank him.
| A．What useful | B．What useless |
| C．How useful | D．How useless |