根据句子意思，用括号中所给汉语提示或英语单词的适当形式填空。在答题卡标有题号的横线上，写出空缺处所填单词的正确形式。
⑴The ____ will drop below zero. (温度) 
⑵You should understand the____ of learning English well.(重要性)
⑶All of us know bad weather sometimes causes ____ disasters. (自然的)
⑷The ____ girl named Susanne in the world weighs nearly 700 kilograms now. （胖)
⑸Ladies and gentlemen, please let me ____  my best friend to you. (介绍)
⑹____ , he didn't hurt badly in the terrible accident. (lucky)
⑺The ____ are busy fishing in the lake. (fish)
⑻The shoes are ____  to wear, I will not buy them. (comfortable )
⑼Help ____ to some meat, boys and girls. (you)
⑽You had better____  at home until it stops raining. (stay)

— Did you study any other languages        English when you were at college?

— Yes, I studied three. But I have forgotten all        a few words of each.

若P是平面$\alpha$外一点，A为平面$\alpha$内一点，$\overrightarrow{n}$为平面$\alpha$的一个法向量，则点P到平面$\alpha$的距离是(  )

《四月提纲》提出（    ）