_________ necessary for students ________ sleep eight hours every night

_________ necessary for students ________ sleep eight hours every night necessary It is necessary for us to help each other(同义） _________ __________ ________ _________is necessary for us we found _________ necessary to save wildlife .A.it B.this C.that D./ It is necessary that you have support teams to bring water and drinks.It is necessary ________ _________ ________have support teams to bring water and drinks. _________(污染）air does harm to our health,it's necessary to keep air fresh and clean author necessary necessary是什么意思 necessary意思? be necessary To read English in the morning is necessary._________　＿＿＿＿＿necessaryto　read English in the morning ． 表示对于时 for与to的区别why are machines so important and necessary _________（to/for）us?为什么不用for. an necessary application 还是a necessary application We provided the sufferers with some necessary help.改为同义句We __________ some neceeeary help _________ the sufferersIn war,life is full of danger for everyone.改为同义句In war,life ______ _____ ______danger for everyone. really necessary的中文翻译 important和necessary区别 if only ,if necessary necessary 的意思