Do your homework before applying for any job. If you rewrote sentence 5 beginning with

did your homework ?

What words did you leave out?

oh um begin the sentence with be sure that you ......

then the answers 1-5 should be the next words.

before applying for any job.

5 is correct.

thanks Sue :)

You're welcome, Piper.

The correct option is 5 - "have done your homework."

To rewrite sentence 5, beginning with the phrase "Be sure that you," the next words should be "have done your homework."

The phrase "have done" indicates that the action of doing your homework has been completed in the past. This implies that you should have completed your homework before applying for any job.