I work in a large office with about thirty other ...

★ Present Tense

I work in a large office with about thirty other people, most of whom ___ (know) quite well.

A. know

B. knowing

C. is knowing

D. have known

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Choose the sentence that has similar meaning: Its ability to catch fish is the key to the polar bear’s survival.

A. The polar bear’s survival depend on their ability to catch fish.

B. The polar bear’s survival is depending on its ability to catch fish.

C. The polar bear’s survival depends on its ability to catch fish.