Combine these pairs of sentences into single ones by using the connectors given in brackets two sentences

VII. Combine these pairs of sentences into single ones by using the connectors given in brackets two sentences.
1. Volunteering is special to many people. They can help others. (because)
_________________________________________
2. He tried hard. He couldn't set up a new world record. (although)
______________________________________
3. They went for a picnic. We went grass sliding. (and)
__________________________________________
4. The TV set did not work properly. I turned it off. (so)
__________________________________________
5. Volunteer work is very hard for teenagers in the city. They enjoy doing it. (but)
______________________________________________