—Mary, could you tell me if your mother ________ our school sports meeting tomorrow?  —I think she will come to school if she _________ free.  
#70853
A
will take part in; will be
B
takes part in; is
C
will take part in; is
D
takes part in; will be
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I really don’t know ______ about it.
#70621
A
what to do
B
how to do
C
to do what
D
how can I do
He could hardly believe his eyes,       he?
#69769
A
didn’t
B
couldn’t
C
did
D
could
It was rather cold yesterday,      ? 
#69710
A
wasn’t it
B
was it
C
didn’t it
D
did it .
—_________________ —They’re under the chair.
#70290
A
Where is your baseball?
B
Where are your baseball?
C
Where are your keys?
D
Where is your keys.?