2. Вставьте предлоги since или for:

1. The bird has been singing __________ about ten minutes.

2. It has been snowing heavily __________ yesterday evening.

3. Cold wind has been blowing __________ the whole night.

4. We haven/t been talking to each other __________ almost a week.

5. Mum has been cooking the Christmas dinner __________ 7 a.m.​