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

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