The word razor is trochaic because it consists of Ra - zor in which ra is accented and pronounced the clearest and loudest. If zor was accented then it would be iambic.
I would say relative pronouns
Answer:
As she was driving home from work, she witnessed terrible road accident.
Explanation:
She saw (witnessed) the terrible road accident as she was driving home from work.
Was driving=> Past continuous
We use past continuous because the word as indicates that the incident is in past continuous.
Witnessed=> Since it's a past event we use past tense.
Hope this helps ;) ❤❤❤