To keep up with the infrastructure ______ the profession also needs to learn how to run large projects more effectively and efficiently in order to make the entire design-engineer-operate lifecycle digital.

单选题

To keep up with the infrastructure ______ the profession also needs to learn how to run large projects more effectively and efficiently in order to make the entire design-engineer-operate lifecycle digital.

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单选题

Prisoners armed with baseball bats used the hostages to keep the policemen （).

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单选题

The airplanes were delivered with recommended inspection programs to keep them airworthy.

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单选题

The fibers of cotton fire hoses ________ up enough water to keep them wet and protect them from the flames.

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单选题

__I cannot keep up with my classmates.

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