complete the following sentences with the past form of the verbs in brackets : ( buy, catch, cost, fall, hurt, sell, spend, teach, throw, write )

1. Mozart.......... more than 600 pieces of music.

2. 'How did yoy learn to drive ?' My father........ me.

3. We couidn't afford to keep our car, so we........ it.

4. Dave..... down the stairs this morning and.......his leg

5. Jim....... the ball Sue, who....it.

6. Ann....... a lot of money yesterday. She....... a dress which......200$.

Bài 1 : Tính tổng :

1/ A = 2/ 1 x 3 + 2/ 3 x 5 + 2/ 5 x 7 + .......... + 2/ 19 x 21

2/ B = 3/ 1 x 4 + 3/ 4 x 7 + 3/ 7 x 10 + ............. + 3/ 97 x 100