C.

They                    

D.

That

(4)

There seems to _________ a storm soon.

A.

have                       

B.

be                           

C.

fall                       

D.

blow

(5)

_________ have been many such accidents here recently.

A.

It                            

B.

There                     

C.

They                     

D.

We

(6)

There must have _________ something wrong with the machine.

A.

gone                        

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