Choose the correct topic sentence to fill in the blank. 为下面段落选择合适的主题句When you buy insurance, you enter into a written agreement with the insurance company. ______. An insurance policy is an agreement between you and the insurance company. It describes what is being insured and the conditions under which protection is to be provided. The policy also states the limits of the protection. The insurance company which provides the protection is known as the insurer. The person or business buying the insurance is known as the insured or the policyholder. The insurer and the insured are known as parties to the contract.