PET candidates often make mistakes with prepositions of place like in, at and on. Circle the correct option in italics in each of these sentences. 1 You can stay in at) my house. 2 We're staying at / in different rooms. 3 My bedroom is the best room of / in my house. 4 It's a large room at / on the second floor. 5 I have some photos in / on the wall. 6 Also I have a big window in / on the left of my bed.