单项选择题

______ that the formation of the sun, the planets, and other stars began with the condensation of an interstellar gas cloud.

A．It is believed
B．Believing
C．Being believed
D．To believe
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单项选择题
Mary is 18 years old this year; she _________ 19 next year.
A．will be
B．is to be
C．is going to be
D．should be
单项选择题
Once you become a soldier, you will be given a monthly _________ by the army.
A．income
B．allowance
C．wage
D．salary
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