1. Until you hear the alarm ringing before I woke up (not. .. until)
2. Because you are doing homework, so I just told you about it (stress period)
3. Although he is very serious, but I found him not difficult to get along well (it as a form of object)
4. Do not blame him, he did not mean to hurt you (on purpose)
5 This is my first time attending such an important meeting discipline (it is the first time that)
追问大虾,although 不能与but一起用的,网上摘的吧?!