The rules of our school don’t allow _______ at school. That is to say, nobody is allowed _______ here.
__________ is no possibility__________Bob will win the first prize in the match.
Shanghai has taken on a new look.It isn’t like__________it used to be.
It worried Mary a lot__________she would pass the college entrance examinations.
__________ caused the accident is still a complete mystery.
__________that they found an unusual plant in the forest.