The correct answer is "earlier".

Sam has to wake up earlier than normal to catch his flight to Florida.

In this sentence, we are comparing two things. The normal time Sam wakes up and the time he has to wake up to catch his flight. When we are comparing two things, we use a comparative adjective and add "er" to the end of a word. When more than two things are being compared, we use a superlative adjective and add "est" to the end of a word.

If the adjective is more than one syllable, we would add "more" or "most" before the adjective. In this case, "early" is a one syllable adjective, so "more" or "most" should not be added to the sentence.

The correct answer is "biggest".

The rosebush is the biggest bush in the back yard.

In this sentence, we are comparing all of the bushes in the back yard. When we are comparing two things, we use a comparative adjective and add "er" to the end of a word. When more than two things are being compared, we use a superlative adjective and add "est" to the end of a word.

If the adjective is more than one syllable, we would add "more" or "most" before the adjective. In this case, "big" is a one syllable adjective, so "more" or "most" should not be added to the sentence.

The correct answer is "loudest".

Jake shouted the loudest during the championship game.

In this sentence, we are comparing all of the people at the game. When we are comparing two things, we use a comparative adjective and add "er" to the end of a word. When more than two things are being compared, we use a superlative adjective and add "est" to the end of a word.

If the adjective is more than one syllable, we would add "more" or "most" before the adjective. In this case, "loud" is a one syllable adjective, so "more" or "most" should not be added to the sentence.

The correct answer is "later".

I sleep-in later than my sister.

In this sentence, we are comparing two things. How I sleep in compared to my sister. When we are comparing two things, we use a comparative adjective and add "er" to the end of a word. When more than two things are being compared, we use a superlative adjective and add "est" to the end of a word.

If the adjective is more than one syllable, we would add "more" or "most" before the adjective. In this case, "late" is a one syllable adjective, so "more" or "most" should not be added to the sentence.