Trắc nghiệm Chuyên đề 5: Writing có đáp án (Phần 2)
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Solar panels are placed on the roof of a house. The Sun’s energy is used to heat water.

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Solar panels are placed on the roof of a house. The Sun’s energy is used to heat water.

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Solar panels are placed on the roof of a house and the Sun’s energy is used to heat water.