____ I say Clancy is a smart boy, he still needs to work hard to achieve his goal．

A．Then

B．When

C．While

D．As

根据汉语意思完成下列句子。

1. 他把一生奉献给了家乡的建设。

He ________________________ his hometown.

2. Sandy不仅歌唱得好，舞也跳得很美。

Sandy ______________ well ________________ beautifully.

3. 章子怡在电影《英雄》中扮演主角。

Zhang Ziyi _____________________ in the film Hero.

4. 他坚持认为他的答案是正确的。

He insisted that _______________________.

5. 家长提醒我们要好好照顾自己。

Our parents ______________________ ourselves.