CHEAT
1) She found out that he was cheating on her.
2) She got married but her husband was cheating on her.
3) She married Peter but he cheated on her.
4) She cheats on her husband.

QUEER
1) I feel queer.
2) She shouted at him that he was a queer.

SPOOKY
1) She didn´t tell us anything about the spooky castle.
2) The coincidence was spooky.
3) Tell us the spooky story!

WATCH OUT (FOR)
1) Watch out for cars when you cross the road!
2) He called us to watch out for the police cars.
3) Watch out for the pickpockets!