____medicine works in a human body is a question ____ not everyone can understand fully.
| A．How; that |
| B．That; which |
| C．What; which |
| D．What; that |
Though Michael had made enough academic preparations, _____ experience led to his failure in the job interview.
| A．lacking | B．lacking of | C．lack | D．lacked |
The school shop, customers are mainly students, is closed for the holidays.
| A．which | B．whose | C．when | D．where |
She said she couldn’t finish the work in time, _______?
| A．could she | B．couldn’t she | C．did she | D．didn’t she |
We went through a period _____ communications were very difficult in the rural areas.
| A．which | B．whose | C．in which | D．with which |
I like getting up very early in summer. The morning air is so good ______.
| A．to be breathed | B．to breathe | C．breathing | D．being breathed |