Some students spend _____ time on the Internet. They forget to eat and sleep.

The two economic reports were delivered byour president at the board last Monday and ______was very instructive

Since here it’s too hot for you，you may ________ go to work in a seaside city.

Not until he got to the factory _______that he had lost his papers.

TV ad, the actress is asked to jump with her mouth ________ open, showing her ________ teeth