Why i cant insert thinks into the tables this is my code

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Why i cant insert thinks into the tables this is my code 

CREATE TABLE employees (

  id int identity not null ,

  EmpFirstName nvarchar(255),

  EmplastName nvarchar(255),

  PRIMARY KEY (id),

);

 

CREATE TABLE suppliers (

  id integer NOT NULL,

  CompanyName varchar(50),

  CompanyAddress varchar(255),

  CompanyPhone bigint not null,

  PRIMARY KEY (id),

);

 

CREATE TABLE products (

  id integer NOT NULL,

  ProductName  varchar(50),

  Productprice integer,

  SupplierID integer NOT NULL,

  PRIMARY KEY (id),

  FOREIGN KEY (SupplierID) REFERENCES suppliers(id)

);

 

CREATE TABLE orders (

  EmployeeId integer NOT NULL,

  ProductId  integer NOT NULL,

  OrderDate date,

  PRIMARY KEY (OrderDate),

  FOREIGN KEY (EmployeeId) REFERENCES employees(id),

  FOREIGN KEY (ProductId) REFERENCES products(id) 

);



INSERT INTO employees(EmpFirstName,EmpLastName,EmployeeAddress)
VALUES ('Иван','Иванов','Хаджи Димитър 25'),
('Милена','Димитрова','Панайот Хитов 3'),
('Миглена','Панайотова', 'Васил Априлов' ),
('Васил','Трайков','Иван Вазов бл 4'),
('Димитринка', 'Станчева','Стефан Стамболов');

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