This is a______ but extremely difficult technology in the future.
#20858
A
satisfactory
B
costly
C
promising
D
far-fetched
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The illness of her son is so ______ that she cannot go to sleep at night.
#19152
A
satisfying
B
worrying
C
surprising
D
puzzling
--How is Tom, do you know ?--____.
#20309
A
He is very clever.
B
He’s right
C
He is much better
D
He is a doctor
 We couldn’t have picked ______ day for the picnic-it rained nonstop.
#20675
A
a worse
B
a worst
C
the worse
D
the worst