We can never expect ____ bluer sky unless we create _____ less polluted world.
—OK,I've had enough of it.I give up. —You can't ________ your responsibilities.
The school isn't the one I really wanted to go to,but I suppose I'll just have to ________ it.
After that,he knew he could ________ any emergency by doing what he could to the best of his ability.
The media can often help solve problems and draw attention ________ situations ________ help is needed.
—Have you ________ some new ideas? —Yeah.I'll tell you later.