The athlete’s years of hard working________when shefinally won the Olympic gold medal.

Times seems __________ when we are playing computer games.

You’re coughing badly，Martin. Why not give up smoking?—Give up smoking？Easier said than done，Amy. Once you ______ the habit of smoking，it is very hard for you to ______.

All of the following are traffic signs except ______.

It is a long time _______they separated, but it won’t be long ____ they meet again