-- ________ is this?                        -- It is  black 
#40951
A
What color
B
What’s color
C
What
D
What’s
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-- I don’t know ______ with this problem. It’s too hard. --- You can ask Mr Wang for help.
#41104
A
which to deal
B
when to deal
C
what to deal
D
how to deal
I don't know _______.Can you tell me________?
#40845
A
how swim; what to do
B
how to swim ; what to do it
C
how to swim; what to do
D
what to swim; how to do
--- My dad bought me a new MP4 player, but I don’t know    .
#40910
A
what to use
B
what to use it
C
how to use it
D
when to use it