Quá khứ đơn hay quá khứ tiếp diễn?

Điền vào các chỗ trống dạng đúng của từ trong ngoặc ở thì quá khứ đơn hoặc quá khứ tiếp diễn. Trong những chỗ trống nào bạn có thể sử dụng used to?

I (1) had / used to have (have) a wonderful biology teacher, Mrs Hughes. She  (make) us excited about the subject because she was so interested herself. I remember one lesson in particular; we  (study) different types of plants, and Mrs Hughes  (describe) the different parts of the flower. She  (pick up) a purple flower, I can't remember exactly what it was, and then suddenly we  (notice) that she  (cry)! She  (apologise) and  (say) that sometimes nature was so beautiful it just made her cry! We  (not / know) what to do at first, but it certainly  (make) us think. Something similar  (happen) while she  (show) us how to work the microscope. She  (examine) a slide of some plant tissue and she  (smile) all over her face. She suddenly  (get) all excited and  (say), 'Isn't it wonderful?' Some students  (laugh) at her when she 19 (not / look) but I didn't. Somehow her enthusiasm  (inspire) me, and I  (start) to like biology.