What is the musical messages?

1) Get out of bed sleepy head

2) He had an ace up his sleeve

3) Ed added the numbers correctly

4) We are eating cabbage and beef

5) Indeed Ed was a bad cab driver

The underlined letters are the blanks oh the worksheet.

your word would be isle.

isle is an island or peninsula especially a small one.

if you add the letter "a" you get aisle, which is a passage between 2 rows of something like chairs, shelves, or something else.