She is not very ____ about the idea of going camping. I think she will stay at home reading.
| A．optimistic | B．enthusiastic | C．confused | D．curious |
He got well-prepared for the job interview, for he couldn’t risk the good opportunity______.
| A．to lose | B．losing | C．to be lost | D．being lost |
_____from lightweight materials，the robots are about the size of a human arm or
smaller．
| A．To build | B．Being built | C．Having built | D．Built |
The fact that smoking is harmful to health is____most smokers are quite aware of．
| A．what | B．which | C．where | D．that |
An example of them is fraud, a crime _______ money is stolen by cheating others.
| A．which | B．that | C．what | D．where |
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 |