给出如下结论：

①EF⊥AC；②四边形ADFE为菱形；③AD=4AG；④FH= $\frac{1}{4}$ BD

其中正确结论的为____（请将所有正确的序号都填上）．

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1).每处错误及其修改均仅限一词。

2).只允许修改10处，多者（从第11处起）不计分。

    It doesn't matter to fail as long as you don't give up. To my opinion, it is hard to be successful. Challenges were a necessary part of your life as you grow up. And you won't necessary succeed in everything for the first time you try. That's okay. Some of the most successful people in the world are the one who've had the most failures. J. K. Rowling, wrote Harry Potter, had her first Harry Potter book reject 12 times before it was finally published. Michael Jordan was removed his high school basketball team. He lost hundreds of games and miss thousands of shots during his career. But he once said, “I have failed over and over and over again in my life. And that's because I succeed.”

动物园内的海豚正在做顶球表演，海豚的这种行为属于____（填“先天性行为”或“学习行为”）

右图是探究燃烧条件的实验装置．

（1）观察到的实验现象是：____ ；

（2）由该实验得，可燃物燃烧的条件是：

①____ ；

②____ ；

（3）实验中发生反应的化学方程式为：　____ ．