单项选择题

With the population explosion, scientists will have to（）new methods of increasing the world's food supply.

A. come up with
B. carry out
C. lead to
D. stick to

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单项选择题
She apologized（）the mess she had made, but her parents were still very angry.

A. at
B. on
C. with
D. for
单项选择题
（）, we decided to go swimming in the se

A. It being a fine day
B. The day was fine
C. It was a fine day
D. Being a fine day
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