The meaning of 25% off is that you only have to pay 75% of the price on the jacket.
"The house doesn't have a basement" is the the sentence that uses the correct form of the verb.
Explanation:
The streams of dust and gas thus released form a huge and extremely thin atmosphere around the comet called the "coma". The force exerted on the coma by the Sun's radiation pressure and solar wind cause an enormous "tail" to form pointing away from the Sun.
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