Define the conditional type in each sentence

1. If they tried to learn that poem by heart, they could get a good mark.[zero|first|second|third]
2. If people don't care about their pets, the pets can suffer. [zero|first|second|third]
3. If Sam had prepared for the trip well, the car wouldn't have broken down. [zero|first|second|third]
4. If the cat wasn't that lazy, it could catch a mouse.[zero|first|second|third]
5. If you don't want to get lost, use maps to help you orient in an unfamiliar city.[zero|first|second|third]
6. If you don't clean your teeth well, you will have caries. [zero|first|second|third]
7. If everybody had cleaned after themselves, we would have lived in a very clean area.[zero|first|second|third]