Prefixes, Suffixes, and basewords

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What word part has been added to the word preschool?

What prefix should be added to the word DO so the new meaning of the word means to do again?

What does the word restart mean?

When the suffix full is added to the word help, what is the meaning of the new word?

What word part has been added to the word unhappy?

What is the baseword of unhappily?

What word means to heat before?

What prefix should be added to the baseword COVER so that the new meaning of the word means to not cover?