根据所给提示，完成句子。每空一词，含缩略词。
【小题1】Chen Ping received an e-mail last Friday. (改为否定句)
Chen Ping didn’t receive How many an e-mail last Friday.
【小题2】There are fifty students in our class. (对划线部分提问)
lends, to hand, in students are there in your class?
【小题3】I often borrow a dictionary from Bruce. (改为同义句)
Bruce often his dictionary me.
【小题4】交卷前你应仔细检查。(完成译句)
You should check your answers carefully before you your paper.
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解析：
【小题1】含有实意动词的一般过去时，借助助动词did 构成否定，实意动词用原形。
【小题2】对数目进行提问，使用How many。
【小题3】borrow …from…“从…借”，强调主语“借入”；lend…to“借…给…”强调主语“借出”。本句是一般现在时，当主语用了Bruce，属于单数第三人称单数，动词要用lends。
【小题4】hand in “上交”，这里用于宾语从句，用一般现在时表示将来，直接用动词的原形。