—Mom，dad is smoking again!—Well，let him cut it ________ gradually since old habits die hard.

Let your child learn to be independent, for _____ he will leave home to lead his own life as a fully independent adult.

His music is            popular today as it ever was.

 It sounded like something was wrong with the car’s engine then, ______ they would have carried on their journey.

In order to save time, I will __________ mention the events that happened last night to refresh your memories before the discussion.