Who / Who's

The teacher asked, "_____ left their book on the desk?"

That’s the girl _____ won the drawing contest!

_____ coming to the school play tonight?

_____ been chosen to represent our class in the spelling bee?

That’s the dog _____ won first place in the show!

_____ was the first president of the United States?

Do you know _____ singing that song?

_____ excited about the school field trip tomorrow?

_____ your favorite character in the book?

She’s the girl _____ won the spelling bee last year.

_____ been to the new amusement park?

_____ knocking on the door?

_____ seen my water bottle? I can’t find it!

_____ been to the Grand Canyon before?

The author, _____ wrote this book, is visiting our school.