1
                             they should study hard for the exam
                     
                                        
                                    
                
                             
                            
                
                    
                        
                            2
                             .he shouldn't has bought a car without airbags
                     
                                        
                                    
                
                             
                            
                
                    
                        
                            3
                             .we …………… drive our car without fastening our seatbelt
                     
                                        
                                        
                    
                             
                            
                
                    
                        
                            4
                             .we …………… missed the bus. we are late now
                     
                                        
                                        
                    
                             
                            
                
                    
                        
                            5
                             .I've got a terrible stomachache. I shouldn't have all that food
                     
                                        
                                    
                
                             
                            
                
                    
                        
                            6
                             .you should …………… to keep your environment clean
                     
                                        
                                        
                    
                             
                            
                
                    
                        
                            7
                             .she should have …………… more careful with her study
                     
                                        
                                        
                    
                             
                            
                
                    
                        
                            8
                             The students …………… on time, but they didn't
                     
                                        
                                        
                    
                             
                            
                
                    
                        
                            9
                             .we should getting ready for the next exams
                     
                                        
                                    
                
                             
                            
                
                    
                        
                            10
                             .the careless driver who..................... the speed limit, the policeman fined him