单项选择题

Were you ______ the phone a lot this afternoon I tried calling you five times and always got a busy signal.

A．on
B．in
C．at
D．by
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单项选择题
Where's Jill She ______ forgotten that we were supposed to meet at 2: 00 PM.
A．would've
B．should've
C．must've
D．could've
单项选择题
______ man, woman, and child in the US should wear a seat belt.
A．All
B．Each of
C．No
D．Every
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