B
1) is writing
2) are losing
3) is having
4) is staying
5) am not lying
6) is
always using
7) are having
8) Are you playing
C
1) Have top musicians been studying (если Present Perfect Continuous не изучали, тоDo top musicians study)
2) haven't touched
3) does
4) Is Christine listening
5) usually buy
6) starts7) Is out team winning
8) enjoy