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
I remember () to the zoo by my father when I was a child.

A. to be taken
B. had been taken
C. being taken
D. to be taking
单项选择题
(), we decided to go swimming in the sea.

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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