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"When young Americans go to university at the age of 18, one of the first things many of them do (1)............ join in a fraternity or a sorority, social organizations for male and female students respectively. "

The answer here (1) is "to". But I think "one of the first things many of them do is to join........" sounds better. Because "one of the first things many of them do to join........" is a phrasal noun, not a clause.

If what I think is wrong, please tell and explain this to me. Thanks!
Comments  
The blank should be filled with 'is to'. 'In' is also wrong:

...one of the first things many of them do (1) is to join a fraternity or a sorority...
This is its link address:
www.tlu.ee/~kivihall/B2.1%20English%20(4.09.12).pdf
Students: We have free audio pronunciation exercises.
You're right, there is no "in". But my teacher added this word to our exercise.
Your teacher was wrong. Emotion: sad
up"When young Americans go to university at the age of 18, one of the first things many of them do (1)...is......... join in a fraternity or a sorority, social organizations for male and female students respectively.
I would just say 'is join' a'.
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I would probably just say "is join" but find "is to join" equally natural.
thanks for all your helps.
canadian45I would just say 'is join' a'.
Yes, I would, too, I think.
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