Sneezing is an excellent way to spread your cold virus to others, so when you sneeze, cover your mouth with a facial tissue, then throw it away and thoroughly wash your hands with warm, soapy water.
A sore throat due to inflammation caused by the cold virus itself and is a common symptom of a cold. You can relieve the symptoms of a simple sore throat with over-the-counter throat lozenges or sprays with a local anesthetic, salt water gargles four times per day (one teaspoon salt in 8 oz. warm water), cough drops or hard candy.
You may also want to use a vaporizer to increase the moisture in your home since a dry throat can cause irritation and pain.
If signs of a sore throat persist for more than a few days or are severe with marked difficulty in swallowing, high fever or vomiting, then your doctor should be consulted.