2xy - (x+y)²

(2x-1) (x-2) - (x+3) (2x-7)

(2x-1) (x-2) - (x+3) (2x-7)

8. The tea isn’t strong. It won’t keep us awake.

à The tea 

9. We couldn’t go out because the weather was bad.

à The weather

10. My sister is too young. She cannot drive a car.

à My sister

5. This coat isn’t warm. I don’t wear it in winter.

- This coat isn’t

6. The radio isn`t small. He can`t put it in his pocket. 

- The radio isn’t

7. She isn’t old. She can’t ride a motorbike to school.

- She isn’t

4. He can carry that suitcase because he is strong.

- He is

3. Hoa was smart. She could answer these questions.

- Hoa was