單項選擇題The problem is（）by pollution.
A.caused
B.because
C.due
D.because of
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1.單項選擇題The mistake was（）by carelessness of the assistant.
A.due
B.caused
C.because
D.owe
2.單項選擇題The volunteers started looking after other children（）parents died of AIDS last year
A.whose
B.that
C.which
D.who
3.單項選擇題I started looking after other children（）parents went out to work.
A.who
B.which
C.whose
D.that
4.單項選擇題That is the dog（）name is Henry.
A.whose
B.who
C.whom
D.which
5.單項選擇題Last week I bought a flat（）biggest room faced south.
A.that
B.whose
C.which
D.where
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