11. Alan didn't use to like to give a speech in public.<br />12. As we all know, sheep feed on grass while birds feed on insects.<br />13. It was the first time that Daisy had used forks to have dinner.<br />14. While Mike was watching TV, his mother was making some cookies in the kitchen.<br />15. Jimmy saw a lot of lively balloons in the sky all of a sudden.
B. 
C. 
E. 
F. 
