移栽树苗时，常剪去部分枝叶，主要目的是（　　）

实现科学发展的政治保证是 （   ）

根据短文内容和所给中文提示，在空白处写出单词的正确形式。每空限填一词。

Dear Future Me,

You are leaving school and stepping into a new world. Well done for completing all ____  (那些) difficult lessons!

You've just found out that you've ____  (通过) all your exams and done your best. You know you'll be able to____  (进入) the fantastic high school. At this moment you must be____ (骄傲的) of yourself.

I'm writing this letter to remind you ____ (再一次) about all the things you wanted to do when you were in the____ (第七) grade. I want you to make sure that before you leave school you'll realise your____ (梦想) as Footballer of the School. Remember that you wanted to be a famous ____ (歌手)? Well, I hope you'll win the top role in the school talent show this year.

If you've done ____  (每件事) you wanted to do, you'll now be a popular and____  (聪明的) student, with a successful future ahead of you.

Don't let me down!

青春，就应该像是春天里的蒲公英，即使力气单薄，藉着风力也要吹向远方。这样，你才会知道世界不再只是一扇好看的玻璃房，才会看见眼前不再只是一堵堵心的墙。飞翔，会让他见识到你未曾见过的东西，让他的人生半径像水一样蔓延到更宽更远。