Parents are doing all they ________ to help their children achieve their ambitions.
| A．shall | B．can |
| C．may | D．need |
Partly _____ about his lost love, he occupied himself with office work.
| A．forgetting | B．to have forgotten | C．having forgotten | D．to forget |
We had planned to arrive at the park at 9 in the morning, but the car _____ halfway.
| A．broke away | B．broke down | C．broke up | D．broke into |
._____ you arrive in Ireland, you will quickly find yourself on the beautiful country roads.
| A．Since | B．While | C．Once | D．Until |
We were caught in the heavy traffic jam. Otherwise, we _____ on time.
| A．would have arrived | B．arrived |
| C．must have arrived | D．should arrive |
.A powerful earthquake struck Haiti, ______ tens of thousands of homeless and buried in ruins.
| A．left | B．to leave | C．leaving | D．being left |