invitation
n. 邀请，请帖

occasion
n. 场合，时刻

permission
n. 允许，答应，同意，许可

politeness
n. 礼貌，斯文，文雅

specify
v. 指定，具体说明，详细说明

technician
n. 技术员，技术人员

have... over
请…过来

change one's mind
改变主意

be particular about
特别讲究…

no later than
不迟于

show... around
领…到处参观

for the sake of
为了

Merry Learning

A Joke

The lecturer had been talking on evolution（进化） for two hours. Then he asked: "If we had tails like a monkey, where are they?"
An old lady thought for a while and then said: "We have worn them off sitting here so long."

Phonetics

y和y的字母组合在单词词尾的读音：
why fly July reply supply
many carry quality
pay play display
boy

Pronunciation and Intonation

A: I give up! I simply can't learn French!
B: Why do you say that? I think you're making a lot of progress.
A: No, I'm not. I try and try and I still can't speak it very well.
B: Learning any language takes a lot of effort. But don't give up.