Regulations _____ that students attend at least 90% of the lectures.
I was reading attentively in my own room ________ suddenly he knocked at the door.
He has five___________ , and they are all doctors working in the same hospital .
I still remember_________to the Famen Temple by my uncle when I was five .
I’ll go to fight in the battle __________ you go or not .
There are countless ________ leaves as if they were a red blanket_______ the ground.