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Perhaps you have heard a lot about the Internet,but what is it,do you know?The Internet is a net...

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couldn’t hear    couldn’t have heard    didn’t hear    wouldn’t have heard  
couldn’t hear  mustn’t hear   couldn’t have heard  wouldn’t have heard  
I heard    I had heard    did I hear    have I heard  
heard    heard of    heard from    have heard  
heard  to hear  hearing  have been heard  
heard  heard of  listened to  listened  
hear  have heard  be heard  hearing  
couldn’t hear   couldn’t have heard   didn’t hear   wouldn’t have heard  
heard about   have heard about   heard   have heard  
have  heard from  since  have  
being sung, sang    sang, singing    sung, sing    to be sung, to sing  
situations  facts   chances  possibilities  
In case   Though   Even   In spite of  
Do you have    Did you have    have you had    Had you had  
heard of  heard about   heard from  heard  
the; the; /    a; a; /    a; the; the    a; a; the  
heard    will hear    have heard    had heard  
couldn’t hear    couldn’t have heard    didn’t hear    wouldn’t have heard  
might not have heard    should not have heard    mustn’t hear    shouldn’t hear  
have heard  from  since  have  

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