It’s said that this kind of plant only gives off this strange perfume on ________ conditions which the scientists are trying to figure out now.
#10953
A
outstanding
B
certain
C
obvious
D
ordinary
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In spite of his disappointment, he _______ a weak smile. 
#10955
A
confirmed
B
persuaded
C
cancelled
D
managed
—Can I help you ? — Please give me two ____________ the eggs.
#14376
A
dozen of
B
dozen
C
dozens of
D
dozens
these
#13411
A
through
B
thank
C
that
D
thunder
A good plan must be _______, so that it can adapt to some necessary changes.
#14280
A
flexible
B
convenient
C
specific
D
considerate