35. Helen devoted herself _______ to her research and became a top scientist in the field of applied physics.　

　 　A. seriously　　　　 　B. extremely　　 　　　　C. entirely 　　　D. strictly

34. Vitamin D helps our bodies make a special chemical，and this special chemical，

__________，affects our brains，making us feel happy.

　　A. in turn　 　　　　　B. in particular　　 　　　C. in advance 　　D. in short

33. Everyone must have known the death of the waitress，________?

　 　A. must they　　 　　　B. mustn't they　　 　　C. haven't they 　D. have they

32. ----Tony is such a selfish person.

　 　----I agree. Never again _________ with him.

　 　A. 1 will deal　　 　　　B. I do deal　　 　　　C. will I deal 　　　D. do I deal