___of them has a dictionary and ___one of them can look up words in the dictionary

Thefallinthecostoflivingisdirectlyrelated_____thedropintheoilprice. [ ]

It is demanded that the letter ___by the end of this week , dad !—-I’ll do it immediately .

Dick, it’s the _______ time in three days that you _______ the same mistake.

Hi, _________ are you going? —To the zoo. I want to see some animals.