4．如图正方形的边长为4cm，则图中阴影部分

的面积为　　　 cm²．

3．如图在Rt△ABC中，∠C=90°∠B=30°，AB=2，

　 则AC=　　 。

2．=　　　　 　。

1．在实数 ，，　 　， ， 　中是　　　　　 无理数 。

Dear Peter,

　　 How is it going? I was busy last week because __________________________________

__________________________________________________________________________________________________________________________________________________________

　　 We’ll have a long holiday from May 1^st to May 7^th. I hope you’ll come to Beijing and play with me. When you arrive on May Day, ____________________________________________

_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

　 Hope to see you soon.

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 Li Ming

Model:

Picture 2

Mary was making clothes when her father came back.

　 Picture 1: Mary ___________________ when her father _____________________.

　 Picture 3: The woman ______________ when she _________________________ her daughter.

　 Picture 4: While the man _________________________, the policeman __________________.

　 Picture 5: While I _____________________________, someone _________________the door.

　 Picture 6: A cat ________________on the bed while the girl ___________________________.

5. _________________________________________________________

4. _________________________________________________________

3. _________________________________________________________

2. _________________________________________________________