若（a^m+1bⁿ⁺²）•（a^2n-1b^2m）=a³b⁵，则m+n的值是______．

句型转换。

1. The fossils were found by a group of scientists. (对线部分媾问)

             were the fossils found         ？

2. They poured the dirty water into the lake nearby. (改为被动句)

   The                              into the lake nearby                .

3. Mom added some salt. (改为被动句)

                              by mom.

4. Meimei was worried and the librarian was worried too. (改为同义句)

   Meimei was worried and                 the librarian.

5. I heard a piece of beautiful music when I came in. (改为同义句)

    A piece of beautiful music                 my ears when I       .