单项选择题

____ millions of galaxies exist in the vast space outside the Milky Way.

A．It is estimated that
B．An estimate that
C．That is estimated
D．That the estimate

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单项选择题

I always get confused about tipping in this country. Usually you __ to leave 15 percent for a waiter or waitress. Taxi drivers expect 10 or 15 percent, too.

A．ought
B．should
C．might
D．can

单项选择题

Physics as well as other subjects __ a science.

A．was
B．is
C．are
D．belong to

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