Please check these sentences for right or wrong.

Combine each of the following pairs of sentences into one sentence by using a semicolon.
Joining the chorus was a great experience for Will. It helped him express his musical talent and gave him a social life.
Joining the chorus was a great experience for Will; and it helped him express his musical talent and gave him a social life.
City life offers many advantages. In many ways, however, life in a small town is much more pleasant.
City life offers many advantages; in many ways, life in a small town is much more pleasant.
The door contains an inflatable slide to be used in an emergency. In ad***ion, each seat can become a flotation device.
The door contains an inflatable slide to be used in an emergency; and each seat can become a flotation device.
Most car accidents occur within twenty-five miles of the home. Therefore, you should wear a seat belt on every trip.
Most car accidents occur within twenty-five miles of the home; so you should wear a seat belt on every trip.
The debate over political correctness affects more than the curriculum. It also affects studentsâ?T social relationships.
The debate over political correctness affects more than the curriculum; and it affects studentsâ?T social relationships.