The difference between ser and estar is primarily in that estar is usually used for something that is not permanent, meaning that it can change. For example, a famous sentence from Mexican telenovelas: Estoy embarazada, which means - I am pregnant. It is not a state that will last forever. Having that in mind, here are the correct answers: 1. delgada (thin, but also of slender build) = C. both. 2. canadiense (Canadian) = A. ser. 3. enamorado (in love) = B. estar. 4. lista (ready, but also smart) = C. both. 5. seguro (sure, but also safe) = C. both. 6. enojada (annoyed) = B. estar. 7. importante = A. ser. 8. avergonzada (embarassed) = B. estar. So, only 1, 4, and 5 can use both verbs.