It is reported that 40 percent of the land in Brazil________covered with trees.
#99160
A
is
B
was
C
are
D
were
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Great as Newton was, many of his ideas _______ today and are being modified by the work of scientists of our time.
#102473
A
are to challenge
B
may be challenged
C
have been challenged
D
are challenging
Ladies and gentlemen, please fasten your seat belts.The plane __________.
#101135
A
takes off
B
has taken off
C
is taking off
D
took off
—I’m going to the States.—How long ________you________ in the States?
#100071
A
are; stayed
B
are; staying
C
have; stayed
D
did; stay
-----You shouldn’t have gone there alone last night .-----But I ______. Philip went there together with me .
#100846
A
didn’t
B
hadn’t
C
wouldn’t
D
wasn’t
— Is Tom still smoking? — No. By next Saturday he ＿＿ for a whole month without smoking a single cigarette.
#104405
A
will go
B
will have gone
C
will have been
D
has been going