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The US president Barack Obama …………….an official visit to Vietnam in May 2016, which is of great significance to the comprehensive bilateral partnership

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She took a course in fine arts ………………starting her own business in interior design 

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It is raining heavily with rolls of thunder. We ……………….such a terrible thunderstorm. 

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New sources of energy have been looking for as the number of fossil fuels continues to decrease 

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The Government has brought ………………a new law in an effort to prevent further environmental deterioration

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A waiter in a restaurant is talking to a customer who has just finished his meal there. Select the most suitable response to complete the exchange

- Waiter: “Here’s your bill, sir”

- Customer: “………………………”

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The science of medicine, which progress has been very rapid lately, is perhaps the most important of all sciences