______ interests me most in the world is the natural beauty of Guilin.
It is wise to have some money ________ for old age.
--You can’t have the horse ________ all the way. It’s too hot.-- Sorry, it ________ my fault. I will stop it right now.
His casual clothes were not ______ for such a formal occasion.
Emily is working hard to be sure not to fail on her first ______.
Without electricity human life ______ quite difficult today.