She had a computer at home, and her parents desired that she _____all her work at home.
| A．do | B．does | C．must do | D．would do |
He __________ that until he __________ the directions once again.
| A．didn't understand ； had read |
| B．hadn't understood ； read |
| C．understood ；had read |
| D．understood ； read |
When they met again in New York, ten years __________.
| A．passed |
| B．was passing |
| C．had passed |
| D．has passed |
__________ the time the firemen arrived, the building had been burnt to pieces.
| A．At |
| B．Till |
| C．When |
| D．By |
__________ industry develops quickly, more and more rivers are being polluted.
| A．When |
| B．As |
| C．After |
| D．With |
Most Chinese musical instruments are quite different __________ western ones __________ shape.
| A．with ； from |
| B．with ； in |
| C．from ； with |
| D．from ； in |