用方框中所给单词的适当形式填空，每词限用一次。            

(1) Take some rest after lunch and you won't feel ____ in the afternoon. .

(2)When the child saw her parents waiting at the school gate, she ran ____  them.
(3)Don't ____  about your exams, everything will be fine.
(4)To protect____ , scientists suggest the people stop fishing in some parts of the ocean.
(5)My host family is really nice .They try____  best to make me feel at home .

修改病句。（不能改变句子原意，能改不删，能添不去。）

①在教室里，都在认真听课。

②他拖着沉重的脚步迅速地向前走。

下列命题：

①三点确定一个圆；

②从圆外一点引圆的两条切线，它们的切线长相等；

③所有的正方形都有外接圆；

④三角形的外心到三角形各个顶点的距离相等；

正确的有（　　）