Tsugi no ryokō no ikisaki o kimemashita.

I have decided on the destination for my next trip.

Kaigi no jikan o kimemashō.

Let's decide on the time for the meeting.

Dono resutoran ni iku ka, kimeru no wa muzukashii desu.

It is difficult to decide which restaurant to go to.

Shōrai no shinro wa mō kimemashita ka.

Have you already decided on your future career path?

Mainichi, Nihongo o ichijikan benkyō suru koto ni kimemashita.

I decided to study Japanese for one hour every day.

Jibun no koto wa jibun de kimenakereba narimasen.

You must decide your own matters by yourself.