Hey there! :)
Answer:
1. She spoke in a very low voice,but l could understand what she said.
2. Shall we make a pizza for dinner?
3. Could l stay a little longer? - I'm sorry, but you can't?
4. Could l borrow your dictionary?- yes, you may.
5. Could you tell me how to get to the station from here, please?
6. You needn't wear a coat. It is very warm outside.