he tries to in class but often failsA.to sleep B.doesn't sleep C.not sleep D.not to sleep

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hetriestoinclassbutoftenfailsA.tosleepB.doesn''tsleepC.notsleepD.nottosleephetriestoinclassbutoftenfa

he tries to in class but often failsA.to sleep B.doesn't sleep C.not sleep D.not to sleep
he tries to in class but often fails
A.to sleep B.doesn't sleep C.not sleep D.not to sleep

he tries to in class but often failsA.to sleep B.doesn't sleep C.not sleep D.not to sleep
he tries (not) to (sleep) in class but often fails