Mark‌ ‌the‌ ‌letter‌ ‌A,‌ ‌B,‌ ‌C,‌ ‌or‌ ‌D‌ ‌on‌ ‌your‌ ‌answer‌ ‌sheet‌ ‌to‌ ‌indicate‌ ‌the‌ ‌sentence‌ ‌that‌ ‌best‌ ‌combines‌ ‌each‌ ‌ pair‌ ‌of‌ ‌sentences‌ ‌in‌ ‌the‌ ‌following‌ ‌questions‌: 

 Alternative sources of energy have environmental advantages. It’s not easy to make full use of them.

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