What is the main idea of the passage?

• A、Exercise strengthens people's body

• B、Exercise helps babies to grow.

• C、Exercise improves people' s lif

• D、Exercise benefits the brain.

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)下周一因為要去參加演講比賽，不能上外教(Prof.Smith)的寫作課。請給他寫一封e-mail，內容包括:

·請假并表示歉意；

·解釋不能上課的原因，如比賽的重要性；

·承諾會自學所缺內容并按時交作業(yè)；

·祝他偷快。