连词成句。
（1） jobs,  are,  their,  what  ( ? )
                                                                    
（2）that,  boy,  is,  David’s,  brother  ( ? )
                                                                    
（3）they,  drivers, too, are  ( , ? )
                                                                    
（4）old,  is,  how,  friend,  your  ( ? )