Fill in for or since.
1)It's been raining.........almost three hours!
2)She's been planning the party...........last Easter
3)Have you been studying English.....................many years?
4)They have been playing tennis .......10am
5)We're been writing to them............our holiday in Crete last year.
6)He's been following her.........months now.
7)Have you been waiting here...........you got off the train?
8)She's been looking at that painting............over an hour.
9)Has he been feeling ill ....... a long time?
10)We've been thinking about buying a new car........last year.