The grass is always greener on the other side.

I'm still on the fence about whether to go on vacation or not.

He received a base on balls and advanced to first base.

I bought a clip-on lamp for my desk.

He is the odds-on favorite to win the race.

I had to make some changes to the presentation on-the-fly.

It's not healthy to dwell on the past.

His pleas for help fell on deaf ears.

I prefer to explore the city on foot.