New Words：
credit ['kredit] n. 信用, 赊欠
proof [pru:f] n. 证明, 证据
Sample Sentences：
Pay with cash or credit card?
He bought the furniture on credit.
Can you provide any proof of identity ?
Have you got any proof that you own this bike?
New Words：
expire [iks'paiə] vi.终止, 期满, 失效
expiration [ˌekspəˈreɪʃn] n.终止, 期满
expiration date n. 有效期
Sample Sentences：
My credit card will expire in June.
When does your driving licence expire?
This ticket has passed its expiration date.
When is the expiration of your driving license?
credit ['kredit] n.信用
reveal [ri'vi:l] vt.显示, 透露, 揭示, 展现
valid ['vælid] adj.有效的, 有根据的, 合法的, 正当的
proof [pru:f] n.证明, 证据
New Words：
license ['laisns]
n.许可证, 执照, 特许
vt.许可;批准
Sample Sentences：
No driving without a license.
The new drug has not yet been licensed in the US.
The restaurant is not licensed for the sale of cigarette.
The credit cards, the driver's license, the cash, all lost to the bus．
New Words：
identity [aɪˈdentəti] n.身份；同一性；一致；特征
identity card 身份证
Sample Sentences：
His driver's license revealed his identity.
A credit card is not a valid proof of identity.
The police asked him to show his identity card.
license ['laisns] n.许可证, 执照, 特许
reveal [ri'vi:l] vt.显示, 透露, 揭示, 展现
credit ['kredit] n.信用
valid ['vælid] adj.有效的, 有根据的, 合法的, 正当的
proof [pru:f] n.证明, 证据
New Words：
clue [klu:] n. 线索, 提示
not have a clue 毫无头绪， 什么也不知道
Sample Sentences：
I'm sorry, I haven't a clue.
The police are busy hunting for clues.
There is no clue to the identity of the thief.
"Do you know the time of the next train? " "I don't have a clue."
identity [aɪˈdentəti] n.身份；同一性；一致；特征
identity card 身份证