⑴Jack is playing on the playground. A.
⑵May will paint a picture for the class. B.
⑶Yesterday Peter got a birthday gift from his parents. C.
⑷Lisa will help her mom with the housework. D.
⑸Jane always reads books after school in the afternoon. E.
⑹Mr Lin is talking with his friend on the computer. F.
的分母加上18,要使分数的大小不变,分子应( )。
(?)