Answer:
<!DOCTYPE html>
<html>
<head>
<title>At School Complex Registration</title>
<meta charset="utf-8">
</head>
<body>
<h1>At School Complex Registration</h1>
<form>
<label for="name">Name:</label><br>
<input type="text" id="name" name="name"><br>
<label for="email">Email:</label><br>
<input type="email" id="email" name="email"><br>
<label for="phone">Phone:</label><br>
<input type="phone" id="phone" name="phone"><br>
<label for="grade">Grade Level:</label><br>
<select id="grade" name="grade">
<option value="kindergarten">Kindergarten</option>
<option value="elementary">Elementary</option>
<option value="middle">Middle</option>
<option value="high">High</option>
</select>
<br>
<input type="checkbox" id="activities" name="activities">
<label for="activities">I am interested in after-school activities</label><br>
<input type="submit" value="Submit">
</form>
</body>
</html>