(A) 根据句意，在答题卡标有题号的横线上，写出括号内所给单词的适当形式。
____ It was raining ____________ (heavy) at this time yesterday.
____ Our headmaster is the        (strict) with us among the teachers who teach us.
____ They looked at our pictures, but they didn't show us ___________ (they).
____ Our English teacher has offered us some useful _______________ (suggest). I think they will help us a lot in our English study.

指出下列材料中的错误，并给出理由：

一个中国商人穿越时空来到公元前5世纪下半期的雅典，发现那里正在开公民大会，就以客人的身份参加了大会，并提出了个人意见。

在体育考试中，小明投出的实心球在空中的运动轨迹如图所示．若实心球重20N，从最高点到落地点的过程中，球下降的高度为2.7m，则（　　）