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!

             是立国之本，是我们党、我们国家生存发展的政治基石。（   ）

用以下三种途径来制取等质量的硝酸铜．

①铜与稀硝酸反应；②铜与浓硝酸反应；③铜先与氧气反应生成氧化铜，氧化铜再跟硝酸反应．

以下叙述不正确的是（   ）

如图所示，是小明探究“影响电磁铁磁性强弱因素”的装置图．它是由电源、滑动变阻器、开关、带铁芯的螺线管和自制针式刻度板组成．通过观察指针B偏转角度的大小来判断电磁铁磁性的强弱．在指针下方固定一物体A，当用导线a与接线柱2相连，闭合开关后，指针B发生偏转．

（1）指针下方的物体A应由____ 材料制成．

A．铜  B．铝  C．塑料  D．铁

（2）当开关闭合后，电磁铁左端应为磁极的____ 极．

（3）实验发现：

①将滑动变阻器的滑片P向左移动过程中，指针B偏转的角度将会____ （填“增大”、“减小”或“不变”）．

②将导线a由与接线柱2相连改为与接线柱1相连，闭合开关后，调整滑动变阻器的滑片P的位置，使电路中的电流　保持不变，可发现指针B偏转的角度将会____ （填“增大”、“减小”或“不变”）．

（4）经过对电磁铁的研究，可得出结论是：当线圈匝数一定时，通过电磁铁的电流越大，电磁铁的磁性越____ ；当通过电磁铁的电流一定时，电磁铁的线圈匝数越多，磁性越____