uncertain sideeffect the medicine will bring about , though about one thousand patients havetaken it.

－What did our geography teacher say－She told us that the earth around the sun.

is the population of your city—There are about four .

The terrible accident might not have happened had the driver been more careful. –But he _____.

do you think of teaching, Bob—I find it fun and challenging. It is a job ______ you are doing something serious but interesting.