He will spend six hours at his desk _______ he finishes his composition.
| A．before | B．until | C．after | D．when |
The stone bridge __________ last year is very beautiful.
| A．built | B．was built | C．being built | D．to be built |
A driver should __ the road when .
| A．concentrate on; drive | B．concentrate in; driving |
| C．concentrate to; drove | D．concentrate on; driving |
_________ in a friendly way, their quarrel came to an end.
| A．Being settled | B．Settled |
| C．Settling | D．Having settled |
His report was so exciting that it was __interrupted by applause（掌声）.
| A．constantly | B．constant | C．seldom | D．never |
He just graduated from the university last month, so he_________ working experience.
| A．lacks of | B．lacks | C．is lacking of | D．lacking in |