You must concentrate _____ your study not on your clothes.
Mom, someone _________. Please pick up the phone.
– Let’s send him home. Do you know _________? -- I have no idea.
– Kate is __________ American girl, right? -- Yes. She is from ____________ United States.
The book must be Lily’s. Look! __________ name is on the cover.
Jack, ___________ play around here. Your sister is asleep now.