There are some health problems that, when _____ in time, can become bigger ones later on.
| A．not treated | B．not being treated | C．not to be treated | D．not having been treated |
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 |
—How did you get in touch with Mrs.Green?
—Well，it seems to me that you've forgotten ________ me her telephone number the other day.
| A．to tell | B．have told |
| C．telling | D．being told |