根据情境及首字母提示填入适当的单词，使短文句意完整、通顺。
Pen pal wanted
   His name is Wang Lei. He is a____ C_____ boy. He wants a pen pal in____ F_______ . He thinks it’s a very____ i______  country and he wants to learn some French. He____ l_____  in Beijing, China with his parents now. He is 14 ____  y______  old and his____ b______  is in November. He can speak Chinese and a little English. What are his ____  l______ ? He likes watching sports games on TV and ____  p_____ computer games with his friends. His favorite subject is computer science. It’s____  f______ . He doesn’t like math, because it’s too difficult.
   Please write to____ h____ and be his pen pal.

八十亿七千五百万写作____, 改写成以万为单位的数是____．

不属于珠江三角洲地区和长江三角洲区域发展经济的优势条件的是（    ）

用弹簧测力计水平拉动木块，使其做匀速直线运动，10s内移动了1m，则木块移动的速度为____m/s．

弹簧测力计的示数如图所示，大小为____N，拉力所做的功为____J．