Answer : 2. "2"
Explanation :

away will not be used because– to pass away (Phr. V.) : to die; end to pass time : to spend time, especially when you are bored or waiting for something/someone to pass (Verb) means to move past Look at the examples given below : The road was so narrow that cars were unable to pass. They passed the time until dinner talking and playing cards. My aunt passed away last month. The years of famine passed away and were followed by years of prosperity. Hence, to pass the time is the right usage.