题目内容

Throughout his life, his family has always been a(n) ________ source of support and reassurance.

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We should never________ the development of industry at the expense of our environment.

His plan frustrated by illness, he has to ________ his disappointment from his friends.

Historic buildings, quiet countryside and cultural traditions all constitute the _______ English now enjoy.

Microsoft has ________ the market for operating system software as its markets share has remained unrivalled among its competitors.

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