You should _____ some English every day. It’s good for your vocabulary.

he H1N1 virus____ at first in Mexico,no one had the least idea that it would spread so rapidly throughout the world

Some people choose jobs for other reasons ________ money these days.[ ]

ne knows that _______ is dangerous to play withfire, but _______ is difficult is to prevent children from playing with fire

The news has _______all over the country _______ the spaceship succeeded in returning to the earth.