1. (Use the gerund trembling as a object of a preposition.)
A: My body perspires heavily instead of trembling.
2. (Use the gerund longing as a direct object.)
A: My longing makes my heart ache.
5 answers
1 is correct. 2 is not.
2. My longing has blinded me.
You haven't really changed this sentence. How have you used "longing" in each of them. And it's not a direct object.
http://www.chompchomp.com/terms/directobject.htm
http://www.chompchomp.com/terms/directobject.htm
2. I suppressed my longing by gorging myself with frozen yogurt.
Now you're right. :-)