Ответ:

1) Emma has never seen snow.

2) Gemma quietly opened the door - all the students were happily discussing the recent news.

3) She is almost never at home, she also rarely visits the library.

4) Dick is never late, he always comes to the office on time.

5) Dogs and horses are exceptionally intelligent animals.

6) He isn't often seen here.

7) Do you ever think about your future work?

8) From time to time I visit the circus.

9) Yesterday John came quite late, and he was surprisingly calm.

10) I am absolutely free now, although I am rarely free.