Unit 7: 1.3 understand deeply about the present perfect

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Guijing's population/increase by/ 1.8 million

Suggested aswer: Guijing's population has increased by 1.8 million

The population density/ go up by/ 25%

Suggested aswer: The population density has gone up by 25%

the land area/ increase by/ 4.5 km2

Suggested aswer: The land area has increased by 4.5 square kilometres (km²).

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