Trắc nghiệm Chuyên đề 5: Writing có đáp án (Phần 1)
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Its ability to catch fish is the key to the polar bear’s survival. depends => The polar bear’s to catch fish.

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Its ability to catch fish is the key to the polar bear’s survival.                             depends

=>  The polar bear’s                                                    to catch fish.

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survival depends on its ability