6. three + twelve =

5. nine ― eight =

 4. twenty-one ― ten =  

3. nineteen + zero =

2. sixteen + thirteen =

1. eight + nine ==

5. The store s       school things,like pencils, rulers and notebooks.

4. I'm fourteen years old. Jack is one year older (比. 大) than me,so Jack is f       years old.

3. ―How much are the pen and the book?

―T      yuan. The pen is twelve yuan and the book is eight yuan.

2. The socks are on s      . They are very cheap (便宜) .