Every minute has been made full ______ of by the girls ______ knowledge about etiquette(礼仪).
________ some students are not aware of is ________ difficult life can be if they are not devoted to study.
________ you are supposed to do ________ you don't like a thing is change it. Don't complain.
His younger sister may already be in high school now, in ________ case this picture book is too childish for her.
It is by no means clear ________ the president can do something to end the strike.
Your cousin is said ________ a new computer program recently, but do you know when he will finish it?