根据首字母及汉语提示，完成下列单词的拼写，使句意明确，语言通顺。

小题1:They d________ ( 设计 ) this TV show specially for children who belonged to the Second Generation of Stars ( 星二代 ).

小题2:It is not polite to enter the classroom without asking for the teacher’s p________(许可 ) if you are late for class.

小题3:He was in such a hurry that he fell d________(楼下).

小题4:He failed the maths test again , which made his mother pretty a________ ( 焦虑 ).

小题5:It was reported that two crocodiles ( 鳄鱼 ) e________ （逃脱）from a zoo but were soon caught and put back into the river.

在昼间遇降雾、暴风雨雪及其他情况，致使调车信号及调车手信号显示距离不足（）时，应使用夜间信号。

A、200m

B、300m

C、400m

D、800m