Read the sentences and choose since or for.

1. It has been raining ..... this morning.

• for
• since

2. I've been working on the project ..... January.

• for
• since

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

• since
• for

4. I have studied non-stop ..... 9.15.

• for
• since

5. He's worked in this department ..... December.

• since
• for

6. He's worked in this department ..... three months.

• for
• since