New Words：

spare [sper]
adj.备用的, 多余的, 闲置的

Sample Sentences：

Every car should carry a spare tire.
What do you like doing in your spare time?
Keep a spare key at your parent's or your close friend's.

New Words：

type [taip]
n.类型
v.打字

Sample Sentences：

Press Shift and type 'A'.
Could you type this letter for me?
She's the type of person that I admire.
A mammoth is a large hairy type of elephant.

admire [əd'maiə] v. 钦佩, 欣赏, 赞美, 羡慕
mammoth [ˈmæməθ] n. 猛犸象; 毛象; 猛犸(象);

New Words：

valid ['vælid] adj.有效的, 有根据的, 合法的, 正当的
invalid [ɪn'vælɪd] adj.无效的, 病弱的

Sample Sentences：

This train ticket is valid for three days.
He had a valid excuse for arriving late at work.
Type the password that is valid for the user name you supplied.

The girl spent all her spare time to take after her invalid mother.
This ticket has passed its expiration date, and so it is now invalid.

supply[sə'plai]
n.供应, 补给,
vt.供应, 提供, 补充

type [taip]
n.类型 v.打字

spare [sper]
adj.备用的, 多余的, 闲置的

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