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 .

皮肤   ____    A、气体交换

肺泡   ____    B、保护、排泄

膀胱   ____    C、暂时贮存尿液

小肠   ____    D、胎儿生长发育

子宫   ____    E、消化吸收

在平面直角坐标系xoy中，以O为极点，x轴的正半轴为极轴的极坐标系中，直线l的极坐标方程为θ=$\frac{\mathrm{\pi }}{4}$，曲线C的参数方程为$\left\{\begin{array}{c}x=\sqrt{2}\cos \theta \\ y=\sin \theta \end{array}\right.$．

（1）写出直线l与曲线C的直角坐标方程；

（2）过点M平行于直线l₁的直线与曲线C交于A、B两点，若|MA|•|MB|=$\frac{8}{3}$，求点M轨迹的直角坐标方程．