Need Help – Simple Sentence

Good day everyone

hope you are doing well

I really appreciate if you could help me for my test question below:

Find the simple sentences in the list below. Give a check (√) in the space provided.

1) ……….. The boy, who was away, is here now.

2) ……….. The man standing in front of the door is the headmaster.

3) ………..  Who stole the money will be discovered soon.

Thanks a lot

Rgds

Yaya