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.