A. aren't; were     
B. are; were             
C. were; are               
D. weren't; are

1. moment / a / were / there / they / ago /.
                                                           
2. like / join / to / would / you / me / ? 
                                                           
3. else / you / what / do / did / ? 
                                                           
4. dog / is / jumping / bed / the / on / the /.
                                                           

1、They did housework just now. 
                                                
                                                
                                                
2、I grew flowers last month. 
                                          
                                         
                                          
3、Tom rode horses the day before yesterday. 
                                                                
                                                                
                                                                
4、She shook her hands and said to us.
                                                      
                                                     
                                                       
5、There were some pencils on the desk a moment ago.
                                                                             
                                                                            
                                                                              
6、You were a good student last term.