看图计算．

5元       1元      3元

用所给词的适当形式填空 
1. A year ____(divide) into 12 star signs.
2. The first ____ (clone)sheep was named Dolly.
3. Stop____(argue) about it. Let’s be friends again.
4. The____(relax) music made us even____ (relax).
5. Amy has just had his bicycle____(repair).
6. It's a good ____ (choose) to____(choose) him as our monitor.
7. It's much____(sun) today than yesterday.
8. ____ (eat) too much is ____（health）for our health..
9. Your advice will be of great ____(valuable) to us .
10. I____ (colour) the card orange ____(cheer)you up and it brought you joy.

为了适应各种不同的需要，常常要把混合物进行提纯：

在直角坐标系xOy中，曲线M的参数方程为$\left\{\begin{array}{c}x=\sin \theta +\cos \theta \\ y=\sin 2\theta \end{array}\right.$（θ为参数），若以直角坐标系的原点O为极点，x轴的正半轴为极轴建立极坐标系，曲线N的极坐标方程为ρsin（θ+$\frac{\mathrm{\pi }}{4}$）=$\frac{\sqrt{2}}{2}$t（其中t为常数）

（1）求曲线M和N的直角坐标方程；

（2）若曲线N与曲线M只有一个公共点，求t的取值范围．