①There is a ping-pong game on April ____ (twenty-nine)．

②____ Tom ____ (like) the tennis game?　

③Jim ____ (have) an art class every day.

④Do you know his brother is only 5 ____ (year) old?

⑤ My mother wants ____ (have) a party for me.

⑥Those boys and girls are all ____ (China).

⑦ -How many ____ (sweater) do you have?        -Three.

⑧Today is my ____ (twenty) birthday.

⑨They want to have two baseball ____ (game).

⑩When ____ (be) the School Day?

一条排水管的截面如下左图所示，已知排水管的半径OB=10，水面宽AB=16，则排水管内水的最大深度是（　　）

 非物质文化遗产“芜湖铁画”（镀金）含有金．铁（其他成分忽略不计）．某同学取一定质量的铁画边角料，加入足量稀盐酸，充分反应后，放出0.3gH₂，剩余固体质量为0.1g．

（1）求样品中铁的质量．

（2）求样品中金的质量分数．

先化简，再求值： $\frac{x^2-2x+1}{x^2+x}$ ÷（1﹣ $\frac{2}{x+1}$ ），其中x= $\sqrt{3}$ ．