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Question 1:
I know you don't want to volunteer this Saturday. However, it is ....... a good cause. Because of your efforts on*^*Saturday, some homeless people will have food and a place to sleep.
A. at
B. by
C. for
D. to

These questions are from this test. Would you like to take a practice test?

Prepositional Phrases - At, By, For and To (2) | C1 – Advanced