语法词汇练习 语法大全 语法详解 英语听力 
I think this is ______ useful book.
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a
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the
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I sent ______ e-mail to Amy to say thanks for her help with my study.
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a
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/
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the
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An
---You should learn English by using it.---What ____useful advice! Thank you very much.
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It’s ________ unusual chance for Mr White to get such ________ useful advice.
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a; an
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a; the
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an; an
I have _____salad for lunch.
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the
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some
---What’s this in English?---It’s ________pencil box.
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