letus(缩写形式)__________
Juiceandwaterarehealthydrinks，_____Cokeisn'thealthydrink
I’mtenyearsoldandmysisteristwoyearsolderthanme，sosheist_____yearsold。
()What'sthisinEnglish?_____ajeep.
()_____youseetheblackboard?
country_________(复数)
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