I’m continually losing my pens these days. I ______ them on my desk, but they disappear somehow.
| A．leave | B．am leaving |
| C．was leaving | D．would leave |
________ 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 |
What do you think of the suggestion that she ________ at the meeting last week?
| A．should make | B．make | C．made | D．makes |