单项选择题

You should try to write ______ even when you're busy. As you know, practice makes perfect.

A．now and then
B．up and down
C．sooner or later
D．here and there
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单项选择题
-- You look very pale. You ______ very tired.-- I didn't sleep at all last night.
A．must be
B．must have been
C．can be
D．can have been
单项选择题
The old man said that this sad story may happen in ______.
A．the 1840's
B．the 1840s'
C．1840s
D．1840s'
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