Could you help me _____ my math? I'm not doing well in it.
[     ]
A. to  
B. in  
C. for  
D. with
Please help me ____my English.    
[     ]
A.with  
B.about  
C.at  
D.for
They're arriving in Shanghai ______ the morning of May 5.      
[     ]
A.at  
B.in  
C.on
Thank you ___ joining CCTV's Around The World show.       
[     ]
A.for  
B.with  
C.to
这些句式你掌握了吗?按要求改写下列句子。
1.Mary helps me to learn English.( 改为同义句)
Mary helps me _______ my English.
2.It is time for supper.( 改为同义句)
It's time ______ ______ supper.
3.I have written three e-mails today.( 改为一般疑问句)
 _____ you _____ three e-mails today?
4.It took two hours from Luoyang to Zhengzhou by train.( 就画线部分提问)
 _____ _____ did it take from Luoyang to Zhengzhou by train?
5.He will go to see a movie tomorrow.( 改为否定句)
He_____ _____ to see a movie tomorrow.
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