Choose the correct item

choose the correct item.
1.helen .......a fax at the moment.
A.is sending   B.sends   C.has sent  
2.they haven't seen each other.......they left camp.
A.before   B.for   C.since
3.my mother.......in a hospital. she's a nurse.
A.works   B.is working   C.has worked
4.Have you called a taxi.........?
A.rarely   B.yet   C.just
5.he.......in ltaly before.
A.lives   B.is living   C.has lived
6.he......his leg, so he can't play football.
A.has broken   B.breaks   C.is breaking
7.paul......Paris for two years now.
A.has been to   B.has gone to   C.has been in
8.costas......a bath at the moment.
A.is having   B.has   C.has had
9.i haven't been to Portsmouth..........three year.
A.since   B.for   C.just
10.they left the house an hour.......
A.last   B.before   C.ago