根据句意，在答题卡标有题号的横线上，写出括号内所给单词的适当形式。
You should never speak to the elderly ________(polite).
The food your mother cooks is _________ (taste) than that my mother does.
Could you help the ________ (Europe) write down their names on the list
In his ________, he passed away peacefully in his dream(九十).