Complete the sentences: 1. mary is (young) then tom. 2. my grandfather is (old) than my grandmother. 3. this box is the (heavy) of all. 4. her hair is (light) than his. 5. oleg is the (tall) of all in our class. 6. my sister is (small) than his. 7. our house is the (big) in our street. 8. this book is (interesting) than that,but this one is the (interesting). 9. a mouse is (small) than a cat. 10. this dres is (expensive) that one,but this is the (expensive) of all.