This morning I saw an old friend of mine in the street by ______.
| A．event | B．accident | C．affair | D．matter |
The young scientist has made such great achievements in his chosen field ______ nobody else can make.
| A．that | B．what | C．which | D．as |
We were told not to touch the equipment in the laboratory unless ________.
| A．allowed to do | B．allowing to do |
| C．allowed to | D．allowing to |
------Where did you first meet your boyfriend?
------It was in the department store ______ he worked.
| A．which | B．that | C．what | D．where |
I think you should go back to your ______ plan, which is much more practical than the present one.
| A．original | B．random | C．abstract | D．ridiculous |
The job is not very profitable ________ cash, but I can get valuable experience from it.
| A．in case of | B．in terms of | C．in return for | D．in addition to |