Walking alone in the dark，the boy whistled to ________ his courage.
| A．hold up | B．keep up |
| C．set up | D．take up |
Mary has her weakness, ___________ that doesn’t mean she is not qualified for her job.
| A．and | B．yet | C．so | D．or |
Do you know the police ______ searching for a thief in the woods now ?
| A．is | B．are | C．was | D．were |
When he was young, his parents died and he had to _____ himself.
| A．accept | B．support | C．carry | D．weigh |
Whether life will continue on the earth will depend on _______ this problem can be solved.
| A．that | B．which | C．whether | D．If |
Only when it is hungry______ a human being.
| A．a lion will attack | B．a lion would attack |
| C．will a lion attack | D．would a lion attack |