Choose the adjective or the adverb for each sentence, as in the example

The cheetah runs fast. [ ]

1. She is a careless driver. [adjective|adverb]
2. Susan thinks school exams are difficult. [adjective|adverb]
3. They sleep late at night. [adjective|adverb]
4. She sings wonderfully. [adjective|adverb]
5. The giraffe is a tall animal. [adjective|adverb]
6. He usually goes to bed early. [adjective|adverb]