Look at these sentences:
Lee opened his present. Krystal opened her present.
Lee is a boy so we use the word 'his', but Krystal is a girl so we use 'her'.
If we are talking about an object we use 'its'.
The house had a hole in its roof.
In this activity, you can practise choosing 'his', 'her' or 'its' to complete sentences.