Yes, you can. To add another blank area in the fill in the blank question:

1. In the Manage Quiz area of the quiz you want to add the fill in the blank question to, click Create New > New Question > Fill in the blanks.

2. Enter the text of the question under Text# 1, the hidden text in the Blank# 1 field and the end of the text in the Text# 2 field.

3. Click Add Blank.

Another Blank field appears after the Text# 2 field.

4. Add the second hidden text in the Blank# 2 field.

5. Click Preview to see wha the question looks like to a student and ensure it is in the correct order.

6. If everything is correct, click Save and Close.

Result

The question has now been saved.