单项选择题

-- I bought this computer for $500 last week.
-- It's on sale this week for only $4,00. You should have waited.
-- Oh, Really But how______I know

A．can
B．will
C．do
D．would
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单项选择题
In order to solve the traffic problem, the municipal government intends to improve the situation with various______of transportation.
A．ways
B．means
C．plans
D．schemes
单项选择题
He deserves______for what he has done in face of crisis.
A．to praise
B．praising
C．being praised
D．having praised
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