--- How long have you _________ there?
--- For about one week.

— How long have you studied English?  

— ______.

--- How long have you _________ there?
--- For about one week.

1. A.
   reached
2. B.
   gone
3. C.
   arrived
4. D.
   studied

---How long have you studied English?

---______.

1. A.
   For 5 years
2. B.
   5 years ago
3. C.
   Since 5 years
4. D.
   5 years before