Since or for in sentences

We have not  met them ---eight years.

• for
• since

Mary has been ill --- Friday. That is ---7 days.

• for/since
• since/for

She has not spoken to me ---many weeks.

• since
• for

He has not done any work --- a month.

• for
• since

--- when have you been married?

• Since
• For

She has not bought any clothes ---December.

• since
• for

He has read 3 magazines --- breakfast.

• since
• for

We have not watched any videos ---the beginning of the school  year.

• since
• for

Pit has not eaten any meat ---ages.

• for
• since

They have not spoken to each other --- their quarrel.

• since
• for