Fill in: ago , since , for, already , until

Fill in: ago , since , for, already , until , ever , never , before and yet .
1 Vicky had been driving .................... hours so she needed a break.
2 Have you .................... seen a tornado?
3 The last time I went abroad was two years .................... .
4 Tom had .................... left the office when I got there.
5 John had been working as a firefighter .................... 2002.
6 They havent come .................... .
7 They waited ................... the hurricane had passed .................... they went outside.
8 Andy had .................... felt an earthquake before