Questions 5`- `8: refer to the following advertisement.
Keep Cool Service Contractors: 
67 Main Road, Edinburgh Village 
Chaguanas, Trinidad and Tobago

         Keep Cool Service Contractors can bring you peace of mind. As part of an annual contract, we will service your air-conditioning system, ensuring your (5) ____________ and comfort. This includes inspecting the system, making necessary repairs, and professionally cleaning your air ducts. (6) ____________ , if necessary, we can replace your old air-conditioning system with a new, cost-efficient one.
         Our workers are highly qualified licensed technicians who stay up-to-date with ongoing training. (7) ____________ . We promise you fair prices and professional work, (8) ____________ by our Keep Cool guarantee. 
Call 1-868-555-0129 for a free quote today.

`5.` (A) safe           (B) safely             (C) safest           (D) safety
`6.` (A) On one hand                                         (B) Nonetheless
      (C) Furthermore                                         (D) And yet
`7.`     (A) Take advantage of dozens of useful online tools.
          (B) Moreover, the air conditioner you chose is very popular.
          (C) Plus, they are friendly, clean, and knowledgeable.
          (D) Thank you for visiting our contractor showroom.
`8.` (A) backed          (B) backs         (C) backing          (D) back