Complete these sentences using comparison or superlative form of adjectives:

1. Jane is
girl in the class. (active)

2. Crocodiles are
animals of all. (dangerous)

3. Neptune is
planet in the solar system. (cold)

1. Jane is the most active in the class.
2. Crocodiles are the most dangerous animal of all.
3. Neptune is the coldest planet in the solar system.

1. Jane is an most active girl in class

2. Crocodiles are most dangerous animals of all

3. Neptune is coldest planet in the solar system

1. Jane is the most active girl in the class.
To complete this sentence, we need to use the superlative form of the adjective "active." When comparing multiple girls in the class, we want to identify the girl who is the most active. Therefore, we use the superlative form "the most active" to indicate that Jane is the most active among all the girls in the class.

2. Crocodiles are the most dangerous animals of all.
To complete this sentence, we need to use the superlative form of the adjective "dangerous." When comparing crocodiles to other animals, we want to identify the animal that is the most dangerous overall. Therefore, we use the superlative form "the most dangerous" to indicate that crocodiles are the most dangerous animals out of all the animals.

3. Neptune is the coldest planet in the solar system.
To complete this sentence, we need to use the superlative form of the adjective "cold." When comparing planets in the solar system, we want to identify the planet that is the coldest. Therefore, we use the superlative form "the coldest" to indicate that Neptune is the coldest planet out of all the planets in the solar system.

In summary, when completing these sentences, we use the superlative form of the adjectives to compare and identify the person, animal, or object that possesses the highest degree of the characteristic described.