Task 2. Complete the sentences using the correct Past Perfect or Past Perfect Continuous form of the verbs in brackets.
1. By the age of 14, he ___(act) in some school performances.
2. i __(enter) competitions for several years before I won.
3. She ___never (study) Sociology until she (go) to university.
4. I (think) of what to write when suddenly I have a great idea for a story.
5. Before he was fifty he (not/enjoy) experiments.