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a _____ is a duty, responsibility, etc. that causes worry, difficulty or hard work.Example:the heavy tax _____ on working people

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A specific area of biotechnology that shows great promise for treatment and cureof life- _______ diseases.

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Constant _______ of attack makes everyday life dangerous here.

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_______ is the technology of sending signals and messages over long distancesusing electronic equipment, for example by radio and telephone.

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There are several places where residents face the threat of _______ every day.

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They are trying to persuade the rich to__________their money to the charities.

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He ______ a major contribution to peace in the region.

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The more powerful weapons are, the more terrible the _______ is.