—Have a break,Amy．You _____________ playing the piano all the morning．
—OK，Mom．I will stop after this piece．
| A．are practicing | B．have practiced |
| C．have been practicing | D．practiced |
This group of designers ______ a plan for the project of the company.
| A．drew up | B．sent up | C．set up | D．turn up |
It was ______ the second-hand bus that the mechanic spent the whole afternoon in the factory.
| A．in repair | B．repaired | C．repairing | D．to repair |
He doesn’t think the question of ______they are boys or girls is important .
| A．if | B．whether | C．which | D．that |
Great changes have taken place in that school. It is no longer _____it was 20 years ago, ______it was so poorly equipped.
| A． What ;when | B．that; which | C． what; which | D．which; that |
A forest is usually found _______ heavy rainfall is frequent.
| A．there | B．which | C．where | D．because |