Answer:
1. Filipinos have recently been complaining that the cost of keeping cool in summer has skyrocketed.
2. It may be the succession of summers with extremely high temperatures that is to blame.
3. The result is high and unwelcome summer electricity and food bills.
4. Electricity prices are the main reason for the chorus of complaints.
5. The cost of nonstop running of an air-conditioner in the unrelenting heat has doubled over the last five years.
6. This refrigerator too has to work overtime.
7. Added to this is the costly array of cooling power drinks that Filipinos now consume to keep body temperatures down.
Step-by-step explanation:
When it comes to questions such as this one, you need to pay attention to the type of information sentences contain and how they're connected to each other.
The sentence that summarizes the information in the paragraph is called the topic sentence. It's usually the first sentence of the paragraph. The topic sentence here would be: Filipinos have recently been complaining that the cost of keeping cool in summer has skyrocketed. It is the best introduction to what the rest of the paragraph will be about.
The rest of the sentences should be organized based on how broad the information they contain is. The second, third, and fourth sentences tell us about the cause of the problem and complaints (broader concepts), while the rest tell us about details and offer an additional explanation for previous sentences (less broad concept).