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3.In each of the following groups of words, there are four underlined letters or letter combinations marked A, B, C and D. Compare the underlined parts and identify the one that is different from the others in pronunciation.

• A、useless
• B、endless
• C、unless
• D、hopeless

We generally have four people working in the shop, but at ____ periods we employ extra hands.

• A、top
• B、rush
• C、tip
• D、peak

Writing: For this part, you are supposed to write an e-mail in about 100 - 120 words based on the following situation. Remember to write it clearly.

你(Li Yuan)下周一因为要去参加演讲比赛，不能上外教(Prof.Smith)的写作课。请给他写一封e-mail，内容包括:

·请假并表示歉意；

·解释不能上课的原因，如比赛的重要性；

·承诺会自学所缺内容并按时交作业；

·祝他偷快。