How to show/hide a word/sentence without line break

I want to create an apps to hide a word in a sentence and onclick a button shows the answer. I use Panel but it creates a line break:-
One apple plus One apple equals         <asp:Button ID="Button1" runat="server" Text="Show" onclick="Button1_Click" />         <asp:Panel ID="Panel1" runat="server"  Visible="false">Two</asp:Panel> apples.
  Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)         Panel1.Visible = "true"         Button1.Visible="false"     End Sub
Onclick of button, it gives me a line break to become like this
One apple plus One apple equals Two apples.
But my desired result is one line
O ...