The old couple are living　　　,for their only son works abroad after graduation.

A.on their own　　　　　　　　　　　B.of their own

C.separately　　　　　　　　　　　　D.particularly

The old couple are living　　　,for their only son works abroad after graduation.

1. A.
   on their own
2. B.
   of their own
3. C.
   separately
4. D.
   particularly