각각 빈칸에 뭐가들어가야 하는지와 답과 이유 좀 알려주세요ㅠㅠ

빈칸에 들어갈 말이 다른 하나는?
1. i know t place ______ she got up this morning.
2. this is the park ______ i first met lucy.
3. the hotel ______ we stayed was very small.
4. mr. smith lives in the house ______ is made of wood.
5. i will build beautiful houses _____ children will sing and play.