Question

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We often answer_____our teacher`s questions____ the lessons.
2.Sometimes they translate instructions ______ Russian_____English
3.Did you learn the poem _____heart yesterday?

Answer 1

1. -, on (первое - пропуск)

2. from, into

3. by

Answer 2

1.We often answer our teacher`s questions at the lessons. 
2.Sometimes they translate instructions from Russian into English 
3.Did you learn the poem by heart yesterday?