Complete each sentence using the past perfect form of the verb in parentheses. 

1. Before Nadia Drake earned her degree, she ____ (be) a ballet dancer.

2. Her father ____ (love) astronomy and Nadia also developed a love for it.

3. The teacher ____ (realize) the topic was difficult, so she explained it carefully.

4. She _____ (plan) to have a different career, but she eventually became a software writer.

5. We weren't surprised when the road changed direction because we____  (study) the map.