2 The Mississippians built

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В тексте находим информацию: The Mississippian people who lived in Cahokia built big mounds of earth in the shape of pyramids. Often, they put a building on top of these mounds. The largest pyramid in Cahokia was over 10 storeys tall! The Mississippians built houses, temples and strong walls to protect their city, too.

Следовательно, можно составить такое предложение: The Mississippians built big mounds of earth in the shape of pyramids, houses, temples and strong walls.

Ответ: The Mississippians built big mounds of earth in the shape of pyramids, houses, temples and strong walls.