14. Don’t try to do everything at once. Take it a bit __________.
| A．at times | B．at that time | C．at all times | D．at a time |
-----Do you know ______ man under the tree?
------Oh, he is _______ university teacher.
| A．a; an | B．the; a |
| C．the; an | D．an; a |
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 |