Под какой буквой нужно вставить фразу на месте многоточия?

1. I was writing a letter when she came.
2. He watched the students working.
3. He is interested in collecting coins.
4. I remember his first coming.
5. Coming to Leningrad I went to Hermitage.
6. They were seen crossing the bridge

John said he ... such animal before.
A) has never seen
B) never saw
C) had never seen
D) was never seen

1) m_r_th_n
2) _ng_n_ _r_ng

He .... hard because he s got a math test tomorrow
My mother is a teacher.She ... in a priamary school.
нужно вставить слово write в правильной форме^
Jane lets go the cinema.- I am afraid,I can not . I ...... an essay.And itll take a lot of time to do it.
She doesnt use a computer orthe Internet, she .... letters to her sons every Friday.