Exercise1. Niagara Falls form a ________________ border between the United States and Canada. (natural/naturally)
2. Tourists visit this place ________________ (frequently/ frequent) .
3. The Falls are very________________ (noisy/ noisily)
4. So you must speak ________________ or nobody can understand you. (loudly/loud)
5. Many years ago, the Iroquois tribe lived here________________ (peacefully/ peaceful)
6. He is a ________________boy. (clever)
7. He is tired because he has worked ________________. (hard)
8. He isn’t tired because he has ________________worked. (hard)
9. She is a ________________girl. (quiet)
10.She went to bed ________________. (quiet)
