5. I wonder the weight of this letter.
我想知道這封信有多重。
還能這樣說：
I want to know how heavy this letter is.
I wonder how much this letter weights.
諺語：
A wonder lasts but nine days.
什么事兒都新鮮不了多久。
6. How long do you think it'll take to get to Beijing?
多久才能到北京？
還能這樣說：
Do you think when it will arrive in Beijing?
How long will it spend getting to Beijing?
諺語：
The wise man has long ears and a short tongue.
聰明人聽得多說得少。
7. Is there anything valuable in it?
里面有什么貴重物品嗎？
還能這樣說：
Are there any dear goods in the envelope?
May I ask if there is anything valuable in it?
應用解析：
good value 花得值，值得買；
of no value 沒有價值的；
set at no value 認為沒有價值；毫不重視；
value oneself on 以……自豪；以……夸耀自己
8. A registered letter must enclose the complete address of the sender.
掛號信必須提供寄件人的詳細地址。
還能這樣說：
The sender's name and address of registered mail should be written in detail.
You are asked to enclose your detail address by registering letter.
應用解析：
send sth. in 將某物寄至某處進行處理；
send sth. off 寄出或發(fā)出某物；
send sb. to 使某人進入某處或某機構