If the guest has more than one piece of luggage.The bellboy will bring a （） and pick up all the luggage.

The programme gives students the（）to learn more about global warming.

A.success
B.ambition
C.opportunity

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（），Edison began experimenting with some thing which he had made himself.

A.On August12，1877
B.In August12，1877
C.At 12August，1877
D.In 1877，August，12

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