按要求做题。    
1. It seems that Polar Bears are gentle animals. (同义句)       
    Polar Bears seems ____                   gentle animals.    
2. I am like this animal because I am strong and intelligent.  (对划线部分提问)       
                are you             this animal?     
3. The bridge was built last year. This photo was taken there. (合并成定语从句)       
    The bridge___      this photo was taken             _____ last year.    
4. The question isn’t easy enough for them to answer. (改为复舍句)   
    The question is             _____ _____ they             answer it.    
5. I really don’t know which sweater I should buy. (改为简单句)      
    I really don’t know ______ ______  to______.