I think it our task to...中的it可以用it's代替吗?为什么?I think it's 后面可以加名词吗?

I think it our task to...中的it可以用it's代替吗?为什么?I think it's 后面可以加名词吗? I think (it) must be our monitor.为什么填it? I don't think it is useful for me to finish the task ----?A can it B is it C can't it D isn't it 为什么 I think it's our duty to keep our environment clean and tidy. I think it our duty to study.I think it completeI think it our duty to study.I think it complete a waste of money.为什么第一句是对的,第二句却是错的? I think it our duty to study.I think it completeI think it our duty to study.I think it complete waste of money.为什么第一句是对的,第二句却是错的呢? i think (it) necessary to save energy in our daily life.不是it's么? I think it----question---- Think it over ,I think it's 77.Do you think it will_____long to finish this task?77.Do you think it will_____long to finish this task?A.take B.spend C.pay D.cost I think it is h＿＿＿ for our English study . i think it is ----that our hometown will become as modern as shanghai(possible) i think our love can do anything we want it to I think it ___good for our health maybe还是 may be .分析这个句子的成分I think our love can do anything we want it to. - Do you think you can finish the task without any difficulty?- Do you think you can finish the task without any difficulty?- Of course not.I'm not so_______ as to think it will be_______.A.simple; simple B.easy; easy C.easy; simple D.simple; easy- D They are our school ’ s volunteers ( ) to help clearly people cross the streetsevery day .A whose task it is B it is whose task C to whom is the task D whose task was Our holidayis from- -to- -.l think it