为了美化城市，经统一规划，将一正方形草坪的南北方向增加3m，东西方向缩短3m，则改造后的长方形草坪面积与原来正方形草坪面积相比（　　）

根据括号内的英(汉)语提示，完成句子。
⑴Nothing can prevent us from ____  (realize) our “Chinese Dream”.  
⑵Unfortunately he had his left leg____ (break) in the high jump last week.
⑶My grandmother often falls____ (睡着) when she watches TV.
⑷Tom____ (write) his lessons when he heard a terrible noise outside.
⑸Mary has curly hair and she is of medium____ (高度).
⑹Lucy often____ (刷) her teeth after meals.
⑺We have walked for a long time. Let’s stop____ (have) some water.
⑻—____you ever____ (be) to an amusement park? —Yes, I have.
⑼— What kind of noodles would you like ?  — I'd like some____ (牛肉) and tomato noodles, please.

①梦想是人生的方向     ②只要努力就一定可以实现梦想

③梦想越大越好         ④梦想是人生的动力

一位汽车旅游爱好者打算到某风景区去观光，出发地和目的地之间是一条近似于直线的公路，他原计划全程平均速度要达到40km/h，若这位旅游爱好者开出 $\frac{1}{3}$ 路程之后发现他的平均速度仅有20km/h，那么他能否完成全程平均速度为40km/h的计划呢？若能完成，要求他在后 $\frac{2}{3}$ 的路程里开车的速度应达多少？