How Do I Automate Month And Gender Menubuttons On "Create Your Google Account Page" In Selenium Wd

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selenium

my code is
public static void main(String[] args) {
// TODO Auto-generated method stub
WebDriver driver=new FirefoxDriver();
driver.get("https://accounts.google.com/signUp?service=mail");
driver.findElement(By.xpath(".//*[@id='FirstName']")).sendKeys("vijay");
driver.findElement(By.className("lastname")).sendKeys("dahiya");
driver.findElement(By.cssSelector(" input[id='GmailAddress']")).sendKeys("ajjjkua2233");
driver.findElement(By.id("Passwd")).sendKeys("abcabc123");
driver.findElement(By.id("PasswdAgain")).sendKeys("abcabc123");
WebElement address=driver.findElement(By.xpath(".//*[@id='Gender']/div[1]]"));
Select ab=new Select(address);
ab.selectByIndex(1); //LAST THREE LINES DOESN WORK