Before driving into the city, you are required to get your car_______。
| A．washed | B．wash |
| C．washing | D．to wash |
The factory was built in a secret place, around ______ high mountains.
| A．which was | B．it was | C．which were | D．them were |
The telephone _______ three times in the last hour, and each time it ________ for my father.
| A．had rang； was | B．has rung； was |
| C．rang； has been | D．has been ringing； is |
The ______ has become extremely tense. A war could break out any time between the two sides.
| A．pollution | B．friendship |
| C．condition | D．situation |
“Aha, you’re a chain smoker！” “Only at home. Nobody _______ that but you.”
| A．discovered | B．had discovered |
| C．discovers | D．is discovering |
In order to learn the _______ of the family business, Bill took a job as messenger boy in one of the offices.
| A．ins and outs | B．dos and don’ts |
| C．heads and tails | D．t’s and i’s |