Ann is only two years old, so we should ______ her.

A．look at

B．look for

C．look after

D．look out

按要求改写句子。

1．从这以后，楚王不敢不尊重晏子了。  

改为肯定句：                                                                      

2．可是橘树一种到淮北，就只能结又小又苦的枳，还不是因为水土不同吗？   

改为陈述句：                                                                                                       

3．李楠小声告诉我：“我有一个秘密。”   

改为转述句：                                                                      

4．我只有用劳动来解除饥饿的威胁。

改为双重否定句：____