1. It has been raining since I arrived home from work.
2.  Tokyo is less exciting than London
3. I have not met them for a long time.
4.  It was such a boring play that we went out in the middle.
5. Although he had a good salary, he was unhappy in his job.

1. It started to rain when I arrived home from work.

It has....rained since I arrived home from work.

2. London is  more exciting than Tokyo.

Tokyo is .not as exciting as London

3. I have not met them for a long time.

It is..a long time. since i last met them

4. The play was so boring that we went out in the middle.
  It was..a boring play that we went out in the middle.

5. In spite of a good salary, he was unhappy in his job.

Although.he had a good salary, he was unhappy in his job.