Answer: 3, "We are going depleting in the mountains this weekend'
Explanation: Depleting means "diminish in number or quantity'. It would make no sense to use that in this particular instance.
Soon his study ivory stride was heard as to and fro he paced and his old rounds upon planks so familiar to his tread that they were all over dented like geological stones with the peculiar mark
D. while and however. is your answer
Note:
"<em>On the other hand, seagulls are scavengers, while wild geese aren't.</em>"
"<em>Seagulls will migrate far inland to search for food. However, they don't follow seasonal patterns of migration like wild geese.</em>"
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