B2+, Pearson focus 5, unit 2 (article writing)
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To go through the roof = ...?
To increase dramatically (e.g.: The price of electricity has gone through the roof.)
To be worth (someone's) while = ...?
Beneficial, interesting or useful enough to justify the amount of time, effort or money spent. (e.g.: Making notes is worth your while.)
The world is (one's) oyster = ...?
You can go/do anything you want, your opportunities are endless
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