--- I paid him 300 yuan for the sneakers．
--- Oh, he charged you too much．You _____ them with half the money．
| A．could have bought | B．needn’t have bought |
| C．must have bought | D．wouldn’t have bought |
________ your son is well again, you no longer have anything to worry about.
| A．If | B．when | C．Now that | D．As soon as |
Here’s a _____ in our office that when it’s somebody’s birthday, they bring in a cake for us all to share.
| A．tradition | B．balance | C．concern | D．topic |
Americans eat____ vegetables per person today as they did in 1990.
| A．more than twice | B．as twice as many |
| C．twice as many as | D．more than twice as many |
The World Wide Web is sometimes jokingly called the World Wide Wait because it ________ be very slow.
| A．should | B．must | C．will | D．can |
, I lost heart in English learning, but my teacher often said to me, “Keep on studying hard , and you’ll succeed.”
| A．At one time; in time | B．At one time; on time |
| C．At a time; in time | D．At a time; on time |