Закончите предложение ,вставляя for или since (Present Perfect Tense)1. Tom has been my friend ... we were five years

1. Tom has been my friend since we were five years old. 2. She has only attended this college for three semesters. 3. We have know each other for ages. 4. She has been on vacation for a few days. 5. He has not visited his girlfriend since last Friday.