For HTML, Level 6 - Lesson 3, here is the answer:
<!doctype html>
<html>
<head>
<title>My Webpage Title</title>
</head>
<body>
<div>The <span style="color:red">Great Barrier Reef</span> in Australia is the largest living structure in the world.</div><br>
<div>Light takes <u>1.255</u> seconds to get from the Earth to the Moon.</div><br>
<div><span style="font-family:Courier">Sneezing</span> with your eyes open is impossible.</div>
</body>
</html>
