Which of the following signs means “Throw litter here.”？ A. B. C.
―I lost the chance to take part in this year’s summer camp. ―_________!
We don’t know _________, maybe at two o’clock tomorrow afternoon.
Our life _________ greatly in the last ten years.
She didn’t finish her homework yesterday evening because she worked too _________.
We’ll do what we can _________ our environment.
B. 
C.
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