1. Excuse me. Is this the parcel post counter?
请问，这是寄包裹的柜台吗?
还能这样说：
Do you take parcels here?
Excuse me, can I post this parcel here?
应用解析：
in excuse of 辩解;
offer excuses for 找借口，推诿;
without excuse 无故;故意;
excuse oneself 替自己辩解;(为某事)表示歉意
2. Please send this parcel for me.
请为我寄这个包裹。
还能这样说：
I'd like to send this parcel.
I need to mail this package.
谚语：
Come day, go day, God send Sunday.
过了一天又一天，上帝快给个星期天。(懒惰者的愿望)
3. I'd like to have this parcel delivered to Taiyuan.
我想把这个包裹寄到太原。
还能这样说：
I want to send this package to Taiyuan.
I want to mail this package to Taiyuan.
应用解析：
deliver oneself to 向……投案，向……自首;
deliver over 交出;移交;
deliver the goods 交货;履行诺言;不负众望
4. I want to send the package C.O.D.
我想用“货到付款”的方式寄包裹。
还能这样说：
I would like to send the parcel by C.O.D.
I'd like to post this package by C.O.D.
应用解析：
pack cards with 与……共谋，串通;
pack sth. away 将某物放入盒或箱等中收起;
pack sth. in 放弃或抛弃……
pack sth. out 人挤满(电影院，剧院等)