Interrogative pronouns

Divide these sentences into two groups.

Fill in the blank with an interrogative pronoun: ... wants ice cream?

Fill in the blank with an interrogative pronoun: ... did you say?

Fill in the blank with an interrogative pronoun: ... is on duty today?

Fill in the blank with an interrogative pronoun: ... is your sister’s name?

Fill in the blank with an interrogative pronoun: ... time do we need to be at the airport?

Fill in the blank with an interrogative pronoun: ... car is that?

Fill in the blank with an interrogative pronoun: ... threw the ball?

Fill in the blank with an interrogative pronoun: ... would you prefer, coffee or tea?

Fill in the blank with an interrogative pronoun: ... of these books have you read?