单项选择题

Astronomers and scientists think that a black hole is a region of space ______ which matter has fallen and ______ which nothing can escape.

A. into; from
B. towards; towards
C. out of; from
D. through; through
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The accident is reported to have occurred （）the first Sunday in February.

A. at
B. on
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You can take anything from the shelf and read, but please （）the books when you’ve finished with them.

A. put on
B. put down
C. put back
D. put off
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