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You’d better keep ______ when I take photos for you.
A.
silent
B.
calm
C.
still
D.
mild
Ancient Greeks were responsible for many of the _______ in science and other fields.
A.
advances
B.
progress
C.
development
D.
civilization
When astronauts return to the earth's atmosphere, helicopters fly to________they would land, ready to collect them.
A.
what
B.
where
C.
which
D.
that
These newly-produced cars are sold at so low a price_____people expected.
A.
like
B.
as
C.
that
D.
which
Students are often warned that anyone who leaves the classroom at night must remember to _____ all the lights, or he will be fined
A.
switch off
B.
go off
C.
take off
D.
bring off
______ began our new lesson.
A.
But
B.
Such
C.
Thus
D.
So that
His way of speaking suggested that he ____ very angry.
A.
should be
B.
be
C.
is
D.
was
Pine trees, of which there are almost one hundred ______, are found throughout the North Temperate Zone.
A.
species
B.
samples
C.
specimens
D.
Standards
Please write me ____ you arrive in New York.
A.
as well as
B.
so long as
C.
as far as
D.
as soon as
Neither Tom nor his parents ______ at home.
A.
is
B.
are
C.
has
D.
was
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