A turtle is _____ than rabbit (slow)

**Решение:** To complete the sentence correctly, we need to use the comparative form of the adjective "slow." The comparative form is used when comparing two things or people. The correct form of the sentence would be: "A turtle is **slower** than a rabbit." In this sentence, the adjective "slow" changes to "slower" when making a comparison between the turtle and the rabbit. This comparative form indicates that the turtle is not as fast as the rabbit. If you have any further questions or need more explanations, feel free to ask!