麻烦请各位帮忙，小弟我文法不好问了些简单的题目，请多见谅。麻烦告知我是哪里错了跟考点是什幺呢，谢谢各位的帮忙。
PP test 1
89. Prehistoric villagers tended to work harder, suffer
from more diseases, and eat the poorer diet than
nomadic hunters did.
92. The major component of the sedimentary rock
called shale is clay, an earthy, fine-grained
material consisting primary of a particular
group of crystalline minerals.
93. Copper was the first metal used by
humans and is second only to iron
into its utility through the ages.
96. Cyclamates were introduced in the early 1950's
as alternative sweeteners for use by individuals
who needed reducing their sugar intake for
medical reasons.
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