Choose the best answer.

______ be addicted to social media, teenagers should spend less time surfing the Net every day.

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

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How much money ______ they ______ upgrading the infrastructure of the city so far?

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

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

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

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______ have enough fresh air to breathe, people should plant more trees around the places where they live.