Read the sentences and choose since or for.

1. I've been waiting ..... 6.30 pm!

• since
• for

2. She's worked there ..... 1999.

• since
• for

3. I haven't visited my home town ..... I left school.

• for
• since

4. She hasn't had a day off ..... 1999.

• for
• since

5. David has known Mary ..... 1996.

• for
• since

6. I've felt a lot better ..... I stopped smoking.

• since
• for