在河南开封政府广场有一幅巨大的电子屏幕，某天显示的是北宋画家的《清明上河图》，专家们利用高新技术使画中的景物动起来，再现了北宋首都汴京的繁华景象。其作品原作者是（     ）

根据下列句子及所给单词的首字母，在答题卷上按题号写出各单词的完全形式（每空限填一词）。
⑴My grandfather likes to water the f____  in the garden on weekends.
⑵The boy is too young. So don't leave him a____  at home.
⑶If I don't help my mom do some h____  on weekends, my mother will be very angry with me.
⑷Last night I didn't go to bed u____  the TV program was over.
⑸Last Sunday I w____  a letter to my father.
⑹I need to look smart for my job i____ .
⑺He f____  his test last week. He should study hard.
⑻He m____  his teacher in the street yesterday.
⑼When the little girl saw the big tiger, she felt very s____ .
⑽Last week, I p____  500 yuan for my new bike.

①混合物：氯水、氨水、水玻璃、水银；②电解质：明矾、冰醋酸、石膏、石炭酸；

③非极性分子：CO₂、CCl₄、CH₂C1₂、对二甲苯；④同位素：¹H⁺、²H^﹣、2H₂、²H³H；

⑤同素异形体：C₆₀、C₈₀、金刚石、石墨；⑥同系物：CH₂O₂、C₂H₄O₂、C₃H₆O₂、C₄H₈O₂；

⑦同分异构体：乙二酸乙二酯、乙二酸二乙酯、二乙酸乙二酯．（   ）

影响我国河西走廊粮棉、黑龙江省大豆、横断山区“立体农业”、海南岛天然橡胶布局的主要因素依次是（　　）