直接写得数。

50-8=              44-6=               75-16=

    Good morning! I'm Bob. This is my house(房子). Look at my sitting room(客厅). The red sofa( 沙发) is very cool, right? In my bedroom(卧室)，there is a computer. I often play computer games on it. Do you like it, too? There is a book and a pencil box on a desk. There is a flower near the sofa. On the wall you can see a picture. It's blue. It's my favourite colour.

    This is my house. What about your house?

在草原上，如果消灭了危害人、畜的狼，草原会出现哪种情况（　　）

若$\overrightarrow{a}$=(1,1),$\overrightarrow{b}$=(1,-1),$\overrightarrow{c}$=(-1,2)，则$\overrightarrow{c}$等于（　　）

按照要求，完成下列的题目。

      ①人的生命只有一次青春。②现在，青春是用来奋斗的，将来，青春是用来回忆的。③只有进行了激情奋斗的青春，只有进行了顽强拼搏的青春，只有为人民做出了奉献的青春，才会留下______、______、______的回忆。