Find the mistake.

Cheap public transportation was highly encourage to use ten years ago, and air pollution has been reduced since then.

Choose the best answer.

They ______ in the suburbs of the city since they ______ their house in the center in 2019.

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He ______ his report on the city planning, so he can have free time and relax now.

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Some parents are worried about their children’s ______ when they go online too much but rarely communicate with their parents face-to-face.

Choose the word CLOSEST in meaning to the underlined part.

Some people don’t feel secure when living in big cities with high crime rates.

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The local authority should ______ more money in improving the quality of their local products so that they can be exported to other countries.

Choose the best answer.

Smoke detectors should be installed in high buildings ______ warn people about fires.

Choose the best answer.

Social media ______ is one of the social issues that many people are concerned about.