Ex12:

1=>d

2=>g

3=>h

4=>a

5=>b

6=>c

7=>e

8=>f

Ex13:

2. I hate cats but I love dogs

3. My brother is 20 years old but he still likes watching cartoon

4. There is not anything left in the fridge so I have to go shopping.

5. All the students have to finish their homework or the teacher will punish thêm

6. James has many book but he rarely reads books.

7. My uncle is suffering from diabetes so he stopped eating sugar

2. I hate cats but I live dog. 
3. My brother is 20 years old but he likes watching cartoons.
4. There is nothing in the fridge so I will go shopping.
5. All the students have to finish their homework or the teacher will punish them.
6. James has many books but he rarely reads books.
7. My uncle is suffered from diabetes so he stops eating sugar.