Construct spanish sentence using indirect object and direct object pronouns

indirect:

He gives the book to María.
DO=Book

Where is the book going?
To María.

IO=María

He gives María the book.
DO=Book

Where is the book going?
To María.

IO=María

Direct:

My mother writes me every week.
DO=letter (understood)
IO=me
(My mother writes me a letter every week.)

She told him.
DO=it (understood)
IO=him
(She told it to him.)