Theworld’spopulationisgettingl

The world’s population is getting larger and larger, so scientists will have to ______ new ways to solve food problem.

A．catch up with

B．keep up with

C．come up with

D．make up with

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I feel tired, but I don’t want to stop _______.

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—Sure. He _______ a lot of time on it every day.

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In the early 1800s, many workers called Monday “_______ Monday”.

A．Blue

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C．Red

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