It is wise of you to well trained workers for untrained ones in your workshop.
| A．substitute | B．change | C．exchange | D．employ |
Look out the traffic when crossing the road.
| A．at | B．of | C．for | D．with |
.Who is making so much noise in the garden?
__ the children.
| A．It is | B．They are | C．That is | D．There are |
The bridge is 1000 meters length.
| A．with | B．in | C．at | D．on |
.—Is there anyone who is gong the Great Wall?
_______
| A．None | B．No one | C．No | D．Not any |
The two countries were between 1989 and 1992.
| A．peace | B．at no war | C．at peace | D．at peaceful |