There has been rising demand for grain as _______ industrial material in spite of the nation’s good harvests.
A．/ ;an B．a; an C．the;an D．a; /
At the meeting they discussed different ______ to the study of mathematics.
A．approaches B．means C．methods D．ways
The children were warned of not being too _______ about things you are not supposed to know.
A．strange B．amusing C．curious D．satisfied
It was difficult to guess what her _____ to the news would be.
A．impression B．comment C．reaction D．opinion
Having been attacked by terrorists，________．
A．doctors came to their rescue B．the tall building collapsed
C．an emergency measure was taken D．warnings were given to tourists
We must know what we should do and what we should avoid ______a good impression on others in public place.
A．to leave B．leaving C．to have left D．leave
