Although I often send e-mails to Tom,I have never seen him____

Although I often send e-mails to Tom,I have never seen him____ Although I study hard,( ) I often fail the exam.A:but B:or C:and D:／ I'm not very strong,______I often exercise.A.but B.so C.because D.although I'm not very strong, ______I often exercise. but, so, because, although选哪个? Although I Need 如题 although we do not see each other very often,i s___think of her as one of my best friend.she always tells me her h______opinios about things. SEN是什么 SEN怎么样 although I sen you He didn't sing the song we want to hear I am often和i am often Although not meet,but I still love Although we broke up,I still love Although math diffcult,but I study hard although i'm only the one to although I stand behind it什么意思? ever so often I I often eat t____.