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1. 
Yes, we have been friends ____________1990.
A.
since
B.
for
2. 
Robert hasn't smoked ____________his birthday.
A.
since
B.
for
3. 
They have studied English _________ 3 years at the high school.
A.
since
B.
for
4. 
Nobody has seen Peter __________ Christmas.
A.
since
B.
for
5. 
____________ three days, George has been telling the same old jokes.
A.
Since
B.
For
6. 
She has been preparing for her exams ___________ the last two months.
A.
Since
B.
For