"Sur" is the proper word for meaning on top in french.
At the top is "au sommet" in French.
sur.
A cherry on top in French is - Cerise sur le gâteau.
au sommet, au top niveau
Dernier etage.
"retour au sommet"
If you mean attic (top of the house) it is grenier in French (literaly the place where you store grain)
camisole, or t-shirt sans manches
Use all of your spare time revising
'ondules' but there has to be a comma on top of the 'e'.
"The yellow bananas" are "les bananes jaunes" in French.
les petits