B4

To learn more about her students, my younger brother's teacher sent home a lengthy questionnaire at the beginning of the school year. There were a lot of questions about this and that.
(past simple, были, мн.ч. oт was )

 BE

B5

She asked them about their likes and dislikes and about many other things.
(их)

 THEY

B6

She asked what they would think about their school in twenty years' time.
(reported speech, при переходе из прошлого в будущее will меняется на would)

THINK

B7

I was 6 years older than my brother but some questions seemed very difficult even to me.
(степень сравнения)

 OLD

B8

I couldn't / could not answer them offhand.
(could – прошедшая форма от can)

NOT CAN

B9

The worst question, in my opinion, was the one relating to their self-image: 'When you look in a mirror, what do you see?'
(превосходная степень)

 BAD

B10

But my ten-year-old brother had no trouble with his answer: 'Myself, and everything behind me.'
(за мной)

 I