一Have you handed in your schoolwork yet?一Yes,I have.I guess it _____ now.
It is written clearly in the requirements that all passengers ______ check onto board 30 minutes before the plane takes off.
—I failed again. I wish I _________ harder.—But you _________.
Drunk driving used to occur _______, but now it is under control.
It gives his life a flying start ______ he has gone abroad for further education.
The experiment has_________ the possibility of the existence of any life on that planet, but it does not mean there is no life on other planets.