House of Porridge                                                                                                               
   Welcome to Clark’s Porridge House. We have different kindsof porridge. We have meat porridge, vegetable porridge, and fruit                porridge is our special. It is only RMB 4 for one bowl. A bowlof meat porridge is RMB 5.Vegtable porridge is RMB 3 for one
bowl, but RMB 5 for two. We have thin pancakes, too. They are RMB5for ten. Come and taste delicious the food here. If you are too
busy to come, call us and we can deliver the food to you in20 minutes.

Fill in the blanks according to the passage Only one word for each blank
   The owner of this porridge house is (1)____ . The cheapestis the (2)____ porridge. If you eat a bowl of meat porridge and  five thin pancakes, you will pay RMB(3)____ . (You can explainit either in Chinese or in English.) The word“deliver”in the last sentences probably means(4)____ . If you order some goodin this restaurant at 6 o’clock, you will probably get it before(5)____ .

计算：$\frac{{\left(x+5\right)}^2}{3x}$÷（x+5）•$\frac{6x}{x+5}$．

两小球A和B，A球系在一根长为L的轻质细绳OA上，B球系在轻质橡皮绳OB上，现将两球都拉到如图所示的水平位置上，让两绳均拉直（此时橡皮绳为原长），然后无初速释放．不计空气阻力，当两球通过最低点时，橡皮绳与细绳等长．关于小球A和B，下列说法正确的是（）

读局部海域表层洋流分布示意图，完成下列各题。

下列各句中划线的成语使用不恰当的一项是（    ）