It’s getting late. We must "be off" now. Which of the following can’t replace the underlined part?
#81598
A
begin
B
be leaving
C
start
D
go
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Who do you ___ we send to cover the bank robbery. 
#69902
A
know
B
suggest
C
think
D
suppose
When did you ___ him?
#80756
A
know
B
knowing
C
get to know
D
get to knowing