why we must sleep

why we must sleep why we must sleep very early can make us better? why are we sleep? Why do we need sleep why don't we sleep? Why are we always tired,do you know?Firstly if we can’t sleep 1 ,Why are we always tired,do you know?Firstly if we can’t sleep 1 ,we will be tired.But we are often too 2 .We can’t finish our work in the day and we must do it 3 night.We go to be Why must we go to bed? why are we always tired,do you know?firstly if we can not sleep That is why we must not waste time. why i must we have to be alive? ( ) we __enough sleep to study well.A.must B.can C.need D.may House,it’s very important for us,because we must study,live ,and sleep in it . We must 谁能帮我翻译这句话,now i must go to sleep but i hope we can chat soon! The following paragraph is incomplete.Read it and provide an opening sentence.How and Why We Sleep(Opening sentence) __________.However,most people rarely think about how and why they sleep.We know that if we sleep well,we feel rested.If we don’t s why must you why must we save our earth 作文要重点在原因上! He is absent today,we must find out why so.这句话错在哪里了,