don't have to, Young citizens who reach the legal voting age of 18 ____________ register if they choose not to, casting a vote is optional., must, A candidate ____________ be at least 21 years old to hold an airline transport pilot license; this is a strict rule., can, Teenagers who hold a valid learner's permit ____________ drive on public roads, but only if a licensed adult accompanies them., can't, An individual under 21 ____________ buy a handgun under federal law; weapon sales to minors are entirely prohibited., doesn't have to, In many European countries, a 16-year-old worker ____________ pay income tax if their earnings fall below the minimum annual threshold., ought, Lawmakers ____________ to raise the minimum age for purchasing energy drinks, as recent medical studies recommend limiting high caffeine intake in teens., mustn't, Drivers under 18 ____________ operate a vehicle with any measurable trace of alcohol in their system, as the state enforces a zero-tolerance law with severe criminal penalties., be allowed, Once a citizen turns 35, they will ____________ to run for the presidency under the provisions of the constitution., not allowed, To prevent youth gambling addiction, high school principals insist that students ____________ to be exposed to online betting advertisements on school grounds., should, Parents ____________ limit their teenagers' driving after midnight, it may lead to the car accidents.

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