Fill in the blanks.
{"id":23060,"questions":[{"type":"fill-in-blanks","id":"550","dataJson":{"prompt":"Fill in the blanks.","options":{"clay":[{"key":"clay","label":"clay","value":"clay"},{"key":"sand","label":"sand","value":"sand"}],"water":[{"key":"oxygen","label":"oxygen","value":"oxygen"},{"key":"water","label":"water","value":"water"}],"flexible":[{"key":"tough","label":"tough","value":"tough"},{"key":"flexible","label":"flexible","value":"flexible"}],"firing/heating":[{"key":"watering/cooling","label":"watering/cooling","value":"watering/cooling"},{"key":"firing/heating","label":"firing/heating","value":"firing/heating"}]},"feedback":"","template":"Pottery is made from {{clay}}, mixing it with {{water}} to make it {{flexible}} and then {{firing/heating}} it in a kiln.","question_type":1,"validResponse":{"clay":"clay","water":"water","flexible":"flexible","firing/heating":"firing/heating"},"fileboyImageId":""}}]}
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Select the missing words in the text.