This type of jewelry is ______, so you’d better buy some as soon as possible.
| A．valueless | B．worthless | C．high | D．priceless |
—People say your little brother has been admitted into QinghuaUniversity.
—Yes. Never ________ he could achieve so much success.
| A．had I thought | B．would I have thought |
| C．could I have thought | D．will I have thought |
________ reducing pullution, man should pay more attention to conserving energy.
| A．As well as | B．As long as | C．As far as | D．As soon as |
I enjoyed very much the three years ______ it had taken me to study English at school.
| A．which | B．what | C．when | D．how |
Being examined twice a year, whether it is a car or a bus or a truck, is the rule that every driver _____ obey in this city.
| A．shall | B．can | C．ought to | D．need |
On farewell party the foreign teacher gratefully _________ all the helps from all the school.
| A．thank | B．acknowledge | C．claim | D．declare |