and make constant effortstowards his goal.

City air is very dirty， so it would be wise ______ you to wash your hair often.— I know， but it is not easy ______ me to do that every day.

____ that we all went out, lying in the sun.

Americans eat _____vegetables per person today as they did in 1910.

In my class, boys don’t love morning _______, but they like doing ______ in the playground.