______ there are living creatures in the outer space as those on Earth hasn’t been proved until
now.
| A．How | B．When | C．Where | D．Whether |
When was it _____ your parents took you to Hangzhou?
| A．before | B．if | C．which | D．that |
It is everyone’s duty to ______ our school a pleasant place to learn in.
| A．find | B．set | C．keep | D．make |
Ever since my brother graduated from the university, he _______ in the present company for 15 years and he is now chief engineer of the company .
| A．worked | B．has been working | C．is working | D．works |
______ me the truth, or I’m not going to leave the room.
| A．Tell | B．Telling | C．To tell | D．If you tell |
It is said that the weather will ______ hot for another three or four days.
| A．look | B．last | C．stay | D．get |