_______about wild plants that they decided 
to make a trip to Madagascar for further research.
| A．So curious the couple was | B．So curious were the couple |
| C．How curious the couple were | D．The couple was such curious |
--Hi, haven’t seen you for ages. Are you doing fine in your job?
--Yeah, I guess. ______.
--Couldn’t be better.
| A．Anything wrong? | B．And you? | C．Thanks a lot. | D．Absolutely. |
The famous star got injured in a traffic accident before her concert ,______ made her fans worried.
| A．who | B．as | C．what | D．which |
It is required that the students ______ mobile phones in their school, so seldom ______ them using one.
| A．shouldn't use; will you see | B．not use; you will see |
| C．don't use; will you see | D．shan't use; you will see |
I tried to call on you last week but your dog simply ___ not let me through the gate.
| A．could | B．would | C．might | D．should |
Dr. Frank failed many times but he finally ______ to find a successful way to solve the problem.
| A．broke off | B．broke up | C．broke down | D．broke through |