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He had a new heart valve _______.

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GPS systems help a lot of people to ___________ on land, on the sea, and in the air.

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In military, A.I. robots are used to _______ dangerous environments containing explosives or contaminated by nuclear weapons.

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 This progamme is used to_______ the new genderation robots.

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Installing is firewall is one method of trying to protect against_______.

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Her_______ was so strong that it brought tears to her eyes.

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______ does not exist yet, but scientists are working hard to create computers that can think like human beings.

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This_______disease caused a lot of complications during the treatment procedure.