Each sentence has a mistake. Find and correct it

Question 19: (1đ) [Báo lỗi câu hỏi]
Each sentence has a mistake. Find and correct it.
1. The boy whom was injured in the accident is now in hospital.
2. The teacher which you met yesterday is fluent in both English and
French.
3. Do you know the year which the steam engine was invented?
4. The English couple whose live next to us can get by in Vietnamese
(Bạn còn 2 lựa chọn)
Question 20: (1đ) [Báo lỗi câu hỏi]
Choose the answer that best combines two sentences given.
I still remember the day. I first spoke to a native speaker on that day.
OI still remember when the day I first spoke to a native speaker.
I still remember the day on that I first spoke to a native speaker.
I still remember the day when I first spoke to a native speaker.