Answer:
1. I bought this for his birthday gift. (adj.)
Do you know what day is his birthday birthday? (noun)
2. I bought two bags: a purple rose and a rose one. (adj.)
This rose smells amazing. (noun)
3. This is a bicycle lane. (adj.)
Mark borrowed his friend's bicycle. (noun)
4. He placed the CD on the top shelf. (adj)
For her date, Julia wore a cute top. (noun)
5. Paper bags are good for the environment. (adj)
For the project, we need two sheets of paper. (noun)
hope this helps! <3