Read these sentences and fill in the gaps with the correct variant (must, mustn’t, have to, don’t have to, doesn’t have to or has to).
 1. They be in a hurry, because they have got more than enough time.
 2. You stop smoking. It is very harmful.
 3. Students look at their notes during the test.
                                                                                                
                            
                            
                            
                                
                            
                            
                                
                            
                            
                            
                         
                    
1 have to.
2 mustn't
3 have to