Uncaught SyntaxError: Unexpected end of input

// The Conditional Challenge
var playerRank = 'No crown';
var numCorrectQuestions = 0;


document.write("<p>Welcome to the Conditional Challenge!</p>");

// Questions 1-5
var question1 = prompt("How many days are in a week?");
if (question1 === 7) {
  numCorrectQuestions += 1;
}

var question2 = prompt("What is the current month?");
if (question2.toLowerCase() === 'february') {
  numCorrectQuestions += 1;
}

var question3 = prompt("What is the current year?");
if (question3 === 2017) {
  numCorrectQuestions += 1;

var question4 = prompt("What is the most widely used programming language today");
if (question4.toLowerCase() === 'javascript') {
  numCorrectQuestions += 1;
}

var question5 = prompt("What is the most popular search engine?");
if (question5.toLowerCase() === 'google') {
  numCorrectQuestions += 1;
}
// End of questions, display final message letting user know the number of questions he/she got right.
document.write("<p>You've answered " + numCorrectQuestions + " questions correct.</p>");

// Rank the player
if (numCorrectQuestions === 5) {
  playerRank = 'Gold Crown';
  document.write("<p>Your rank: " + playerRank + ".</p>");
} else if (numCorrectQuestions >= 3) {
  playerRank = 'Silver Crown';
  document.write("<p>Your rank: " + playerRank + ".</p>");
} else if (numCorrectQuestions >= 1) {
  playerRank = 'Bronze Crown';
  document.write("<p>Your rank: " + playerRank + ".</p>");
} else {
  playerRank = 'No Crown';
  document.write("<p>Your rank: " + playerRank + ".</p>");
}