Sure! Here’s a possible completion of the text using the appropriate forms of the verbs in the past simple or past continuous:

I (1. have) **had** a wonderful biology teacher, Mrs. Hughes (2. make) **who made** us excited about the subject because she was so interested herself. I remember one lesson in particular; we (3. study) **studied** different types of plants, and Mrs. Hughes (4. describe) **described** the different parts of the flower. She (5. pick) **picked** a purple flower; I can't remember exactly what it was, and then suddenly we (6. notice) **noticed** that she (7. cry) **was crying**. She (8. apologize) **apologized** and (9. say) **said** that sometimes nature was so beautiful it just made her cry! We (10. not/know) **didn't know** what to do at first, but it certainly (11. make) **made** us think. Something similar (12. happen) **happened** while she (13. show) **was showing** us how to work the microscope. She (14. examine) **examined** some plant tissue and she (15. spill) **spilled** it all over her face. She suddenly (16. get) **got** all excited and (17. say) **said**, "Isn't it wonderful?". Some students (18. laugh) **laughed** at her when she (19. not/look) **didn't look**. Somehow her enthusiasm (20. inspire) **inspired** me, and I (21. start) **started** to like biology.