问题:

在下列各句的空白处填入一个最恰当的单词,使句子意思完整,语法正确。 1.  I"m afraid to talk with others in English because my_______English is poor.
2.  John ran more_______than the others and missed the train.
3.  Be careful not to make the same_______in grammar.
4.  It"s a_______between you and me.  Don"t tell others.
5.  Taking lots of_______in class is very helpful because you can review well after class.
6.  To _______with, she spoke too quickly, and I couldn"t understand every word.

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