If you go for a long ride in a friend's car, it's the custom to offer to __________ some of the expenses.
| A．pay |
| B．pay off |
| C．pay for |
| D．pay back |
—Mum，why do you give me so much popcorn?
—__________the boring time.
| A．Kill | B．Killing |
| C．To kill | D．Having killed |
What did the librarian__________out of the library?
| A．permit to take | B．forbid to be taken |
| C．allow to take | D．insist being taken |
Mr.Smith was much surprised to find the watch he had had__________was nowhere to be seen.
| A．repairing | B．it repaired |
| C．repaired | D．to be repaired |
__________along the quiet road at forty miles an hour，and then an old man suddenly started to cross the road in front of me.
| A．Driving | B．I was driving |
| C．Having driven | D．When I was driving |
The policeman came up to the lonely house with the door __________，__________there for a while and then entered it.
| A．open；to stand | B．opening；stood |
| C．open；stood | D．opened；standing |