___ the red switch on the left and the flying machine will swiftly go up into the air and ____its journey.     
[     ]
A. Pressing; begins  
B. Press; begin
C. Pressed; begins  
D. To press; to begin
__________ your compositions carefully and some spelling mistakes can be avoided.
[     ]
A. Having checked      
B. Check      
C. If you check      
D. To check    
________ yourself with positive people and you will keep focused on what you can do instead
of what you can’t.
     [     ]
A. Surrounding          
B. Surrounded              
C. Having surrounded          
D. Surround
____ the tower building,where you see the whole city.
[      ]
A. Standing on the top of              
B .If you climb to
C. When you reach the top of         
D. Get to the top of  
Please do me a favor-_____ my friend Mr. Smith to Youth Theater at 7:30 tonight.
[     ]
A. to invite      
B. inviting        
C. invited      
D. invite  
Please do me a favor -      my uncle John to the party this Thursday.
[     ]

A. to invite
B. inviting
C. invite
D. invited

Mary,_____ here. Everybody else,go to the gate quickly.    
[     ]
A. come            
B. comes              
C. to come              
D. coming
_____ and I'll get the work finished.
[     ]
A. Have one more hour
B. One more hour
C. Given one more hour
D. If I have one more hour
—Shall I lock the lab before I go home?    
—_____! I'll check it myself later.    
[     ]
A. Go ahead    
B. No problem    
C. No hurry    
D. Don't bother
There are eight tips in Dr Roger's lecture on —sleep, and one of them is: _____ to bed early unless you think
it is necessary.

[     ]

A. doesn't go
B. not to go
C. not going
D. don't go
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