Landing safely in bad weather is a _______ task for any pilot, and even the smallest error can lead to a disaster.
#17896
A
tricky
B
secure
C
significant
D
easy
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Despite being taken from very different sources, the results are remarkably _________.
#17952
A
consistent
B
constant
C
contradictory
D
controversial
Speaking of all the songs he has written, I think this is probably his ________ one. 
#20778
A
better-known
B
well-known
C
best-known
D
most-known
The two pens are the same, but the red one cost _____________ that one.
#19459
A
as much twice as
B
twice as much as
C
much as twice as
D
as twice much as