By the middle of the 21st century, the vast majority of the world’s population _____ in cities rather than in the country.
The manager suggested an earlier date _______ the meeting.
Leaves are found on all kinds of trees, but they differ greatly ________ size and shape.
I have offered to point the house _____a week’s accommodation.
Everything was perfect for the picnic ______ the weather.
Don’t promise anything ______ you are one hundred percent sure.