On a hill in front of them___________ a great castle.
A.standing
B.stand
C.to stand                   
D.stood

Only once a day___________ home.
A.does Mary leave      
B.left Mary               
C.Mary leaves            
D.will Mary left

Only if I had known the difference___________ the more expensive car.
A.would I bought                                         
B.I would have bought
C.would I buy                                              
D.would I have bought

Amoebas reproduce by dividing___________
A.and other protozoans                                
B.as do other protozoans
C.other protozoans do                                
D.we taking

Error Identification

Hardly had he entered the office when he realized that he forgot his wallet.
A.had 
B.the
C.when
D.forgot

_____ a week goes by without some road accidents.
A.Hardly  
B.Seldom
C.Never
D.Infrequently

"Is this machine often in need of repair?" "No, ___________ problems to arise".
A.Seldom don't we expect                            
B.We expect seldom
C.Seldom we expect                                     
D.Seldom do we expect

____ had he entered the office than he realized that he had left his wallet at home.
A.Hardly 
B.Scarcely
C.No sooner             
D.Not only

Little  ______ what he has caused to others.
A.does he know        
B.he knows            
C.he can know           
D.he will

Just after solving one problem, I was faced with another.
A.Scarcely had I solved one problem when I was faced with another.              
B.Hardly had I solved one problem when I was faced with another.                    
C.No sooner had I solved one problem than I was faced with another.
D.All are correct.