1. 读一读，把左右两边英语与数字连起来。

①six and nine                     a. 90            A. nineteen

②thirteen and eight            b. 87            B. twenty-one

③fifteen and four               c. 15             C. ninety

④eighty and ten                 d. 19             D. eighty-seven

⑤seventy and seventeen     e. 21             E. fifteen