-You must call them every week.-Yes, I _____.
| A．must | B．should | C．have to | D．will |
On hearing a great noise, Mike looked forward through the window _____ what happened outside the room.
| A．to seeing | B．to see | C．seeing | D．to have seen |
We hadn't met for 20 years, but I recognized her_____ I saw her.
| A．the moment | B．for the moment |
| C．the moment when | D．at the moment when |
________evidence that language acquiring ability must be stimulated.
| A．If being | B．It is | C．There is | D．There being |
The professor could hardly find sufficient grounds _____his arguments in favor of the new theory.
| A．to be based on | B．to base on |
| C．which to base on | D．on which to base |
A survey was carried out on the death rate of those who were infected by SARS,________were surprising.
| A．as results | B．which results |
| C．the results of it | D．the results of which |