Mass deaths of birds were not unheard of, but they normally happened unnoticed at sea or in rural areas away from towns. Many birds are weak and die in winter _______ food is scarce.
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which
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what
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when
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how
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Usually there is a blackboard on the front wall in the classroom, _________there is a slogan.
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Members of the Beijing Wheelchair Dance Training Base, was set up in 2009, are able to manage their wheelchairs perfectly.
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who
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that
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Tom hid himself behind the door, _________ he could hear the steps of his mother clearly.
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The teacher set such a difficult problem ________none of us could solve.
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Funny animals is a term used in comics and animated cartoons __________ the animals are given human characteristics.
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where
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that
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why
D
as