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I suggest the government should ______ the number of visitors to Son Doong everyday.

Complete these sentences with the correct form of the verbs given.

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It is hoped that any defensive measures _______ to protect and preserve our man-made wonders. 

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_______ the best time to visit the complex of Hue Monuments is in April.

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“What is the best way to get around the Old Quarter?” – “_______”

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________ that many of our man-made wonders have been damaged.

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He suggested that we ______ to the theatre instead of staying at home.

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The show features six competitors from different parts of the country.