Perseverance is a kind of quality --- and that’s ________ it takes to do anything well.
| A．why | B．that | C．which | D．what |
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 |
“What’s your opinion on the matter, please？” “Oh, sorry, I _______.”
| A．wasn’t to listen | B．haven’t listened |
| C．wasn’t listening | D．hadn’t listened |