根据中文意思完成句子。

69.亲爱的，你蛋糕吃得太多了。为什么不留点儿明天吃呢？

Darling, you're eating too much cake. ____________leave some for tomorrow?

70.告诉他开会的时候不要讲话。

____________ at the meeting.

71.我过去常常嘲笑那些犯错误的人，但是现在我改了。

I____________ those who made mistakes, but now I don't do it any more.

72.六年的时间让我明白了一个道理：学习的时候，最重要的不足我们做r多少题，而是我们花了多少时间思考。

____________learn something: it doesn't matter how many exercises we do, it does matter how much time____________ while learning.

73.这些年来，您不仅仅是妈妈，还是一·位朋友，谢谢您帮助我度过了很多困难时光。

____________many hard times these years,__________.

翻译下列句子。

1. 谢谢你送给我的邮票。

Thank you _______________________________me the stamps.

2.—你做了多长时间的作业了？    —两个小时了。

—How long _______________ you _________________________ your homework? 

—______ two hours.

3. 自从她六岁以来, 她一直弹钢琴。

She has been_________________________ since she ______________ six years old.

4. 那使我想起了美语和英语的不同。

That _______ me of _______________between American English and British English.

5. 我的头发太长了, 明天我将去理。

My hair is too long, I________________________ it _________________ tomorrow.