--Someone's been here. Who ________ it be? It looks like Helen.

--It ________ be her. She is ill in hospital.

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The lady took out some ________ pork from the fridge and cooked it in the kitchen.

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They will send you the book for 2.75 dollars, postage ________.

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She didn't answer the phone. She ________ be asleep.

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Mary's coming back last night gave us ________.

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--Excuse me. Is this the right way to the Summer Palace?

--Sorry, I'm not sure. But it ________ be.

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I don't believe him; he ________ be serious.

[　　]

Tom, don't worry. You ________ get the book tomorrow morning.

[　　]

Since she is angry, we ________ leave her alone.

[　　]

--Don't get near to the tiger. It's too dangerous!

--________.

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