I didn’t have to work all weekend — I did it by _______.
| A．chance | B．choice |
| C．accident | D．myself |
That suit __________ over 60 dollars.
| A．has costed | B．costed |
| C．is costed | D．cost |
Tom __________ into the house when no one __________.
| A．slipped; was looking | B．slipped; had looked |
| C．had slipped; looked | D．was slipping; looked |
They asked me to have a drink with them. I said that it was at least ten years since I __________ a good drink
| A．had enjoyed | B．was enjoying |
| C．enjoyed | D．had been enjoying |
Mr. Green __________ for more than ten years.
| A．died | B．has died |
| C．is dying | D．has been dead |
By the time he was twelve, Edison __________ to make a living by himself.
| A．would begin | B．has begun |
| C．had begun | D．was begun |