— Will you help me with the trouble?

— I won't,          you tell me the truth.

    Hi! I'm Linda. I am ____ English girl. Now I'm in Shanghai with my parents. There is a ____ store next to my house. ____ name is Xingxing Clothes Store. You can buy all kinds of ____ in it. They have sweaters at a very good ____. Do you need bags? They ____ great bags for 26yuan each. They have hats ____ red, black and yellow. They ____ have nice skirts for girls. For ____, they have shorts and sports socks. Do you ____ to come here? Let's have a look this afternoon.

把一个小球以30m/s的速度水平抛出，它落地时的速度为50m/s．（g取10m/s²）求：

没有错别字的句子是（   ）。

如图是关于小猫和小聪的一幅漫画，图中两条光线的夹角是60^o，则小聪观察小猫的光路的入射角是____，此现象说明光在反射时光路是____。