Question

FILL IN FOR/ SINCE:
1- They've worked five or six hours.
2- Nobody has come
3- She has been a doctor
4- Nobody has seen her
we bought this small house.
1998
he was a child.
5- They have been ill
6- I have tried to finish this letter
the last week.
the last half an hour.
then.
7- He bought the car in 1999 and he has driven it
8- Pete went to the library. He has studied there.
9- It has been very foggy_early morning.
10- I've lived with you _nine years.
a long time.