---What is the child doing now?

---He used to write with a pencil, and now he is ______ with a pen.

1. A.
   tried writing
2. B.
   trying writing
3. C.
   to try to write
4. D.
   trying to write

—What is the child doing now?

—He used to write with a pencil, and now he is ________ with a pen.

[　　]

　　－What is the child doing now?

　　－He used to write with a pencil, and now he is ________ with a pen.

[　　]