You can only be sure of __________ you have at present; you cannot be sure of something __________ you might get in the future.
If they had known what was coming next, they __ their mind.
New Zealand's universities offer a wide __ of courses in many fields, including the arts, economics, communications and technology.
My teacher has never lost his temper; that is to say, he is a __ man.
in the ticket hall for almost an hour, I suddenly realized I had left my ID card home.
— Watch out! The petrol __. — Oh, my God. We have to find a service station soon enough.