We have been told that under no circumstances_______ the office telephone for personal affairs.
| A．may we use | B．we can use | C．we could use | D．did we use |
Only ________ according to the directions can the medicine be quite effective.
| A．taking | B．taken |
| C．being taken | D．having been taken |
The man we followed suddenly stopped and looked as if ________ whether he was going in the right direction.
| A．seeing | B．having seen |
| C．to see | D．to have seen |
—Hi，Mary.Would you like to go to the concert this evening?
—Sorry，Tom.________ tomorrow's lessons，I have no time to go out with you.
| A．Not preparing | B．Not having prepared |
| C．Not to prepare | D．Being not prepared |
Every student in our class had an application form in his hand，but no one knew which office ________.
| A．to send it to | B．to send it |
| C．to be sent to | D．to have it sent |
—O'Neal works hard.
—So he does.He is often seen ________ heavily before his teammates have even arrived at practice.
| A．to be sweated | B．sweated |
| C．be sweated | D．sweating |