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What are you doing _____ vacation?
A．for
B．in
C．on
D．at
The accident happened _________ an autumn early morning.
A．in B．at C．on D．for
Children often make mistakes spelling.
A．in B．for C．on D．at
I’ll be ready _____________a minute.
A．on B．at
C．for D．in
They are waiting_____ the bus stop.
A．at B．for C．on D．in