Question

Simons ... is smallbut nice(на конце слова ss) There are two big ... in my flat(на конце se) . They put old Things in their ...

Answer 1

Simons chess is small but nice. There are two big cases. They put old things in their cases.

Answer 2

Simon's chess  is small but nice.
There are two big bookcases in my flat. 
They put old things in their pantry.