Fill in the blank with the correct form of the given word.

British cavers have made some important

about Son Doong Cave. (discover)

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Thanks to the promotion scheme of this travel agency, this abroad trip is ____ to my family.

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If you want to see historical places, it is a good idea to go on a guided _____.

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They spent two weeks at a fashionable ski _______ in Switzerland.

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They met on board of a luxurious yacht during a ______ in the Caribbean.

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After changing trains three times we arrived at our _______ in the end.

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I was offered a 50% discount for my staying at that five-star resort, so I could enjoy the holiday to the full without breaking the ______.

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If you want to book a package tour, you should contact the .......... which I introduce to you previously.