单项选择题

Surveys show that the majority of passengers are pleased that an agreement has been reached to forbid smoking on _________ flights within the continental United States.

A．economical
B．commercial
C．global
D．internal
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单项选择题
As the market was _________ goods, the economy became more balanced , and inflation went down.
A．speculated on
B．subscribed for
C．saturated with
D．submitted to
单项选择题
If you have not signed a contract, you are under no _________ to pay them any money.
A．responsibility
B．liability
C．circumstance
D．obligation
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