1. Helen is (beautiful) girl I have ever seen.
2. This is (difficult) lesson we've studied this course.
3. What's (wide) street in this city?
4. Of all the students, Bob is . (smart)
5. Mr. Smith bought (expensive) necklace in the store.
6. What's (long) river in South America?
7. Brazil is (big) country in South America.
8. Of all the students, John got (bad) grades.
9. I think this sofa is (comfortable) of the three.
10. Peter is (outspoken) person I've ever met.