Although math diffcult,but I study hard

Although math diffcult,but I study hard Although Math is difficult,I study hard要不要加it Although I study hard,( ) I often fail the exam.A:but B:or C I study hard,but I am still not good at math(改为同义句） I study hard, but I am still not good ai math.同义句 study math really hard I am going to study math really hard grades,although,good,I,study,get,hard,don`t,I(?)连词成句 But now,I will study hard to realize my dream. Now I study math really hard so that I can be m__ in the fut I must study hard? Although he is very clever ,but he does not work hard.句子改错 I