请改正下列各句中运用不得体的词语。
①请问家父高寿啊？（寒暄用语） ____改为____
②涂鸦之作，敬请拜读。（赠书用语） ____改为____
③李和平先生敬启（信封用语） ____改为____
（1）已知a、b、c、d是成比例线段，其中a=3cm，b=2cm，c=6cm，求线段d的长．
（2）已知线段a、b、c，a=4cm，b=9cm，线段c是线段a和b的比例中项．求线段c的长．
— Would you mind _____ me to carry the box? It's too heavy.
— Not at all.
My father is very busy and doesn't come back home until midnight.
—Excuse me, madam. Could you please tell me _________ the bus arrives? —Sure. At 9:00.
