单项选择题

My wallet is nowhere to be found. I ______ when I was on the bus.

A．must have dropped it
B．must drop it
C．should have dropped it
D．ought to have dropped it
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单项选择题
______ the importance of wearing seat belts while driving.
A．Little they realize
B．They little do realize
C．Little realize do they
D．Little do they realize
单项选择题
Arriving at the bus stop, ______ waiting there.
A．he found a lot of people
B．a lot of people were
C．he found a lot of people's
D．people were found
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