单项选择题

The scientists have absolute freedom as to what research they think it best to _________.

A．engage
B．devote
C．seek
D．pursue
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单项选择题
She wanted to serve some coffee to her guests; however, _________.
A．she hadn't many sugar
B．there was not a great amount of the sugar
C．she did not have much sugar
D．she was lacking in amount of the Sugar.
单项选择题
_________ is not a serious disadvantage in life.
A．Not being tall
B．Not to be tall
C．Being not tall
D．To be not tall
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