simple JSTL problem

In the below simple JSTL, I do not know why "this is true " and "this is false " can NOT be output ?
Thanks
//-------------------------------
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<html>
<body>
<c:forEach var="i" begin="1" end = "10">
<c

ut value="${i}"/>
<c:choose>
<c:when test=" ${i%2 == 0}">
<c

ut value=" this is true"/><br>
</c:when>
<c:when test=" ${i%2 != 0} ">
<c

ut value="this is false"/><br>
</c:when>
<c

therwise>
this is otherwise <br>
</c

therwise>
</c:choose>
</c:forEach>
</body>
</html>