What does the prefix re as in review mean?

What does the prefix un as in unanswered mean?

What does the suffix ful as in blissful mean?

Erica was asked to spell the word cat. She spelled it k-a-t. Erica misspelled the word. The prefix mis most likely means--

To misbehave means to --

If you overload the washing machine, it means you put too much clothes in it.

A ________  comes at the beginning of a word and can change its meaning.

Choose the word that best fits the definition, does not attach.

Add a prefix or a suffix to the uppercase word to make the sentence correct.

Mom says she is very HOPE that I will do well on my test.

If someone is a scientist, what does that mean?