—The two old friends were ____ busy ____ with each other that they forgot the time.—Yes. They hadn’t met for over ten years, so they kept talking the whole night.       
#37336
A
too, to talk
B
too, talking
C
so, to talk
D
so, talking;
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This box is __________ than that one.
#36147
A
heavy
B
heavier
C
heaviest
D
the heaviest
I think this talk is worth          .
#44005
A
to listen
B
to listen to
C
1istening
D
1istening to