1. --- Did you at the party, Owen?
--- Yes, I was very happy.
A. enjoyed yourself B. enjoy yourself
C. enjoy yourselves D. enjoyed himself
2. The story I read in the newspaper was about a common problem among teenagers.
A. whose B. who C. that D. where
3. One of the places of interest are often visited is the Niagara.
A. that B. what C. who D. where
