根据所给提示，完成句子。每空一词，含缩略词。
Chen Ping received an e-mail last Friday. (改为否定句)
Chen Ping                              an e-mail last Friday.
There are fifty students in our class. (对划线部分提问)
                            students are there in your class?
I often borrow a dictionary from Bruce. (改为同义句)
Bruce often                his dictionary                me.
交卷前你应仔细检查。(完成译句)
You should check your answers carefully before you                           your paper.