单项选择题

According to the periodic table, ______ still some elements undiscovered.

A．there seem to be
B．it seems to be
C．it seems that
D．here seem
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单项选择题
Vicky has been sad recently, for her plan to go to college ______ at the last moment.
A．fell out
B．fell behind
C．fell through
D．fell off
单项选择题
He ______ a sum of money every month to help the two orphans.
A．sets aside
B．sets up
C．sets along
D．sets in
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