I haven't bought a new watch because my old ________ still works．

1. A.
   it
2. B.
   one
3. C.
   that
4. D.
   this

— Mum, have you seen my mobile phone?

—_________you bought last week? I’m sorry I haven’t seen _________.

1---Mum, have you seen my mobile phone?

---_______ you bought last week? I’m afraid I haven’t seen _______.

A. The one; it      B. The one; one     C. One; it      D. One; one