In nature some animals actively defend the area ____they depend for the resources.
| A．in which | B．on which | C．which | D．where |
I was lucky enough to get on the train before it ________.
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The man must be the leader of the group, easily ________ by his special uniform.
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Teamwork, or cooperation, is ________ it takes for a football team to win a game.
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The missing children haven’t been found yet. Something terrible ________ to them.
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—Hello, I’d like to see Doctor Smith at 3 o’clock tomorrow afternoon.
—Sorry, but he ________ a patient at that time.
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