The following text is for question 1-5These days, increasing number of households use gas hot water systems, which mostly burn LPG (liquefied petroleum gas). It is a good solution if you live in an area with limited sunlight for a solar hot water system.
There are two main types of hot water systems. The first is storage water heaters, which heat and store water in an insulated tank for use when it is needed. The second is instantaneous systems (or continuous flow systems), which only heat water when it's needed and don't use a storage tank.
The second type is the most popular in the country, as it is more affordable. In instantaneous systems, the water is heated by a gas burner as it flows through a coiled pipe called a heat exchanger. The gas burner starts when a hot water tap is turned on. It only heats the amournt of water that is required instead of continuously heating a full tank.

1. What is the topic of the text?
A. How instantaneous hot water systems work
B. Popular hot water systems in the country
C. The use of insulated tanks to heat water
D. How storage water heaters work
E. The use of hot water systems

2. Which of the following statements is incorrect based on the passage above?
A. Instantaneous hot water systems are cheaper than storage water heaters
B. Storage water heaters heat and store water in an insulated tank
C. Gas hot water systems are the best solution in cloudy areas
D. The use of gas hot water systems are the best solution in cloudly areas.
E. Continuously flow systems heat water continuously in a tank

3. Based on the text, what happens when the hot water tap is pressed?
A. Water spills out of the tap
B. The burner starts heating water
C. Water flows into an insulated tank
D. The heat exchanger heats the water
E. Water is continuously heated the water

4. "The second type is the most popular in the country, as it is more _affordable_." (paragraph 3)
The underlined word is similiar to...
A. Cheap
B.Excessive
C. Expensive
D. Exaggerate​
E. Extravagant

5. “ ... Which heat and stroke water _in_ a insulated tank for use when it is needed.” (paragraph 2)
The underlined word refers to....
A. instantaneous hot water system
B. Storage water heater
C. insulated tank
D. Heated water
E. Cold water​