Say who decides and fill in mast or have to . I _____ walk my dog . I ______ walk my dog . I _____ feed my hamster .

I decide (Я решаю): 

I MUST walk my dog. I MUST feed my hamster. I MUST water the plants. I MUST weed the garden.

Someone else decides (for example, my parents, grandparents or other relatives) - Кто-то другой решает (например мои родители, бабушка с дедушкой или другие родственники):

I HAVE TO walk my dog. I HAVE TO feed my hamster. I HAVE TO water the plants. I HAVE TO weed the garden.