Unfortunately, ____ stone hit him on ______ head and he got injured．
| A．the; a | B．a; 不填 | C．a; the | D．the ; the |
Pandas are native ______ China.
| A．with | B．to | C．for | D．in |
No product is allowed to go into the market if it fails to _____ the quality standard.
| A．live | B．come up to | C．meet | D．go through |
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 |