It’s bad ____ for a man to smoke in the public places where smoking is not allowed.

I’m told that you are going to Canada to have a three month further study. Don’t let such a good chance to improve your English _____ through your fingers.

I have ___ work to do.

As the quality of the city’s air continues to give rise to ______, the residents are encouraged to set off fewer fireworks.

Always read the_______on the bottle carefully and take the right amount 0f medicine。