1 and 2 are correct
3 and 4 incorrect
Multiple answers, the questions says lettuce, _______, and green peas are vegetables. So pick a vegetable and name it. The other commenter was correct, las zanahorias are carrots. El maiz is corn, los tomates are tomatos, la papa is a potato, la cebolla is onion, so on and so forth. Just choose one.
What conjugation? sorry i cant help you.
