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1. A. Yes, we should.      
B. No, we shouldn't.      
C. Yes?

2. A. I've been in a shoe factory.
B. I've gone to a shoe factory.
C. I went to a shoe factory.

3. A. Two years ago.      
B. In two years.          
C. Since two years ago.

4. A. Yes, it is.          
B. No, it isn't.            
C. I'm not sure.

5. A. Yes, it is.          
B. No, it isn't.            
C. I've no idea.