Don’t use words, expressions, or phrases_______ only to people with specific knowledge,
#94395
A
being known
B
having been known
C
to be known
D
known
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There’re so many kinds of tape-recorders on sale that I can’t make up my mind _____ to buy.
#98788
A
what
B
which
C
how
D
where
Madame Curie is believed _______ radium.
#96123
A
discovering
B
having discovered
C
to have discovered
D
to discover
At the news of the earthquake, the soldiers did what they could the victims.
#95425
A
help
B
to help
C
to helping
D
helping
All of us didn't notice Tom come into the classroom because the light happened to ________ at that time.
#93903
A
give in
B
put up
C
go out
D
switch off