题目内容

Here are some tips to help you stay safe when _____(use) ride-hailng apps.

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If you couldn't keep the ______(appoint),please inform us as early as possible.

There is something wrong with the printer, and I'll have it _______(repair).

The project turned out to be _____(easy)than we though because we had support of many people.

You should read this manual _______(careful) before you start to use the device.