_____ he comes, we won't be able to go.
What! ________ to go there with _______? No!
The international agreement, ______ to encourage children not to smoke and help people kick the habit, was signed on February 27.
― Why ______ you stay in the countryside, where it’s not convenient to go shopping?―But I’ve found it rather valuable for my health.
The view ____ many scientists hold is ____ too much emission of carbon dioxide is destructive.
_____ this afternoon, you would have to come again next week.