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a)  I used new website which I can learn grammer.  It is useful to review some grammer.  I also used Net Academy.  I like this website.
b)  I could learn grammer again.  I am not good at grammer.  I need to review grammer of high school level.
I studied reading and listening on Net Aacademy.
c)  I studied grammer about 25 minutes.  I studied using Net Academy about 40 minutes.
d)  I should study grammer more.  I think it is regarded as a basic ability using English.