[ Prepositions ]
2) Choose the correct combination of prepositions to complete the following sentence: I am writing_______ behalf __________ my friend.
A. To/of
B. By/of
C. On/of
D. For/of

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A. so many
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A. is
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A. isn’t going to buy
B. isn’t going buy
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They _____________________ go to school today. It’s Thanksgiving.
A. Must
B. Mustn’t
C. Needn’t