We can never expect _______bluer sky unless we create ______ less polluted world.
__________ with so many difficulties, I had difficulty __________ my dream of running a store of my own.
You've failed to do what you __________ to and I'm afraid the teacher will blame you.
He is the only one of the students __________ want to accept the teacher's advice.A. that don't B. who don'tC who doesn't D. that do
It is reported that many a new house __________ at present in the disaster area.
More than one student __________ sent to the hardest place since 1979.