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All the old carpets need ________（更换）.

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It is not a good idea to miss meals and _____ ______ them（改吃）snacks.

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Teachers will never be ________（代替）computers in the classroom.

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We should help _____ _____（发展）of poor countries.

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Now India is a ________（发展中）country, while America is a ________（发达的）country.

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The city has _____ _____（发展成为）the center of industry.

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I ________（养成）the habit of eating between meals.

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New machines _____ _____（被研制，被发展）to improve the work.

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He is _____ ______ _______（第三个最高的）boy in our class.

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Success _____ ______（来自）hard work.