At central high school they ring a bell to end every class period. sometimes, by mistake, they ring the bell in the middle of a class period and teachers find that many of their students get up to leave not realizing that only about half of the class time has gone by. the students have learned this behavior via

michael joseph jackson was an american singer, songwriter, and dancer. dubbed the "king of pop", he is widely regarded as one of the most significant cultural figures of the 20th century and one of the greatest entertainers of all time.

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the correct answer is modern american cars are not available due to trade restrictions.

trade between cuba and the united states have serious restrictions. the u.s. imposed an economic embargo on cuba, that among other things means that modern american cars are not available due to trade restrictions.

in response to some governmental actions of the authorities from cuba, president john f. kennedy proclaimed an embargo on trade between both countries in february 1962. the trade embargo remains active until this day and was implemented directly by the departments of commerce and the department of treasury.

in president trump’s administration, there is a national security presidential memorandum that "strengthens the policy of the u. s.", affecting trade with cuba.