Закончи вопросы, используя нужно форму глаголов : is, are, или do, does harry a troll?

Is Harry a troll?
Does Harry a troll?

University can be useful, trees can be high, grandparents can be old, when i sleep a lot i can be fast, forest can be wide, dress can be new, medicines can be expensive, polar bears are cold, cats are beautiful, playing is interesting, chineses are ugly, people are strange. I can eat at nights quietly, i can wake up noisely, i can walk quickly, i can run fast, i can draw often, i can laugh loudly, i can do my homework lazily, i can ask politely, i can push somebody angrily, i can open doors gently, i can be careful with fire

Notebooks can be useful. Mountains can be high. Houses can be old. Cars can be fast. Roads can be wide. Cellphones can be new. Bicycles can be expensive. Ice cream can be cold. Sunsets can be beautiful. Books can be interesting. Garbage can be ugly. Paintings can be strange. I can watch TV quietly. I can wash the dishes noisily. I can walk quickly. I can ride a bike fast. I can sing loudly. I do homework lazily. I greet people politely. I canangrily stomp my feet. I can take care of my baby sister gently. I can paint carefully.