It’s strange that they_____nothing about this matter. 
#89891
A
know
B
would know
C
knows
D
knew
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Look at the trouble I am in! If only I ______ your advice.
#86926
A
followed
B
would follow
C
had followed
D
should follow
— Why! I _____ get you on the phone. — We ______ basketball on the playground when you phoned. 
#89278
A
didn't; must be playing
B
couldn't; must be playing
C
couldn't; must have played
D
didn't; must have been playing