【C19】A．because ofB．becauseC．forD．from

__ you are tired, you had better sit down.A.because ofB.AsC.ForD.when

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【23】A．ofB．withC．forD．in

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【C19】A．partly becauseB．mainly becauseC．not becauseD．not because of

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【C19】A．ofB．atC．inD．for

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【C5】A．ofB．withC．forD．to

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20．A．ofB． toC． forD． from

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The reason for my absence was ______ I had fallen ill.A.whyB.becauseC.forD.that

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