to the best of his ability.

If you talk nice and polite, people listen to you. If you shout, this is no good,?

Tom is very stupidHe fails in every exam–_____, he is more lazy than stupid

No one can imagine the difficulty hehad _______ his son to get rid of the habit of playing computer games

Though ____ the dangers of smoking to their health, smokers still find it hard to give up smoking.