Please open the door ________ the dog．

1. A.
   to
2. B.
   for
3. C.
   of
4. D.
   at

---Dad, please open the door．It ______．

---OK, dear．I am coming．

1. A.
   locks
2. B.
   locked
3. C.
   is locked
4. D.
   was locked

-Dad, please open the door; it ________．

-OK, dear．I'm coming．

1. A.
   locks
2. B.
   locked
3. C.
   is locked
4. D.
   was locked

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