–Would you mind if I ______ here?
–______. It’s not allowed.
| A．smoke; Yes, please | B．smoked; You’d better not |
| C．smoke; That’s all right | D．smoked; You are welcome |
. Charles Babbage is generally considered _______ the first computer.
| A．to invent | B．inventing | C．to have invented | D．having invented |
. The missing boys were last seen _______ near the river.
| A．playing | B．to be playing | C．play | D．to play |
. The patient was warned _______ oily food after the operation.
| A．to eat not | B．eating not | C．not to eat | D．not eating |
. I regret _______ you that we are unable to offer you employment.
| A．informing | B．having informed | C．to inform | D．to informing |
. You had better get a doctor _______ your bad tooth.
| A．pull out | B．to pull out | C．pulled out | D．pulling out |