To understand the grammar of the sentence，you must break it ________ into parts.
| A．up | B．down | C．off | D．out |
I was reading attentively in my own room ________ suddenly he knocked at the door.
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He has five___________ , and they
are all doctors working in the same hospital .
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I still remember_________to the Famen Temple by my uncle when I was five .
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I’ll go to fight in the battle __________ you go or not .
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There are countless ________ leaves as if they were a red blanket_______ the ground.
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