按要求改写下列句子，每空只填一词。 
1. They had a good time in Beijing.（改为同义句）  
    They                            in Beijing.
2. I learn English by listening and speaking.（对画线部分提问）    
                              you              English? 
3. She went to Beijing last year.（改为否定句）  
    She                           to Beijing                             . 
4. Tom does his homework carefully.（改为感叹句）    
                               Tom             his homework! 
5. Mary, water the flowers.（改为现在进行时）  
    Mary                           the flowers.