The workers will go on strike if the demands they __________ are turned down.

The air pollution is terrible. – It will be worse ________ we take action to protect the environment.

n’t got the reference book yet,but I’ll have a test on the subject next month.—Don’t worry. You ____ have it by Friday.

. — _______made her struggle to become an artist so hard— ______ she was a woman.

rmers were sure that fresh water lay____ in the earth, so they dug ____ to findit