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)

一位同学在测量质量时，在天平的右盘中无论怎样加减砝码，都不能使天平平衡，可采用的方法是（ ）

“天苍苍，野茫茫，风吹草低见牛羊”的景观指的是青藏高原．（  ）（判断对错）

下列所示结构中属于肽键的是（　　）