You can be sure of _____ you have at present ; you cannot be sure of something_______you might get in the future .
Ladies and gentlemen, please fasten your seat belts. The plane ____________.
It was not until midnight ______ the noise of the street stopped.
I’d prefer ______ in the office rather than _____ at home watching TV.
I have never dreamed of ______such a beautiful place in the world.
The hunter insisted that he _____ a tiger and that a searching team ______ to hunt for it.