根据汉语提示完成句子。
1. 如果你是美国总统，你会做些什么？    
                     _______ you do if you                    the president of the USA?
2. 我要是有很多钱，我就会做医学研究。    
     If  I had lots of money, 1 would do                   _________.
3. 如果他们不来怎么办？没有他们我不能做这件事。   
                    _______ they don't come? I cannot do it without them．
4. 我很想要只猫，但是我的父母亲不让我养。    
    I really want a cat. but my parents won't                                 ________ ________.
5. 如果你对人们比较友好，你会有许多朋友。    
    If you were                 ________ to people, you would have more friends.