单项选择题

It is only ______ care and planning in this generation that the food supplies of the sea can continue for future generations.

A．with
B．at
C．on
D．over
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单项选择题
It was ______ because he was tired out that he fell asleep standing up.
A．publicly
B．openly
C．specifically
D．obviously
单项选择题
John promised to keep his mother ______ of how things were going on when he studied in England.
A．to be informed
B．to inform
C．informed
D．informing
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