写出空缺处各单词的正确形式，每空只写一词。

Tom's mother gives three____ paʊndz to him every week.

A

    What picture do you have of the future? Will life in the future be better, worse or the same as now? What do you hope for about the future? Scientists think that life will probably be very different in 2050.

    First of all, it seems that people won't use TV channels by 2050. Instead, people will choose a program from a "menu" and a computer will send the program directly to the television.

    Water will become a very serious problem. We'll need much more water, but there won't be enough. Some scientists think that water would be the cause of war.

    Cars will run on new clean energy and they will go very fast. And there won't be any accidents with the help of computers. On the other hand, space planes will take people around the world in two hours.

   Robots will work in factories instead of people. Many factories have already used robots. Big companies prefer robots—they do not ask for money, and they work for 24 hours a day.

    In a word, by 2050, our life will change a lot and our future will be quite different from now.

A: I want to make a banana milk shake. Would you like to do it with me?

B: ____. We need three bananas and a glass of milk.

A: OK. What can we do?

B: ____.

A: What's next?

B: Put the bananas and ice-cream in the blender. ____.

A: Everything is ready. Can I turn on the blender?

B: Yes, you can. But only a few minutes.

A: OK. Is that all?

B: No, you must pour the shake into a small cup and then drink it.

A: Wow, it's so delicious. ____

B: Let's give it to our mother first. She will like it, too.

A: ____ Let's go.

如图所示，A和B的质量分别是1kg和2kg，弹簧和悬线的质量不计，在A上面的悬线烧断的瞬间（　　）