The morning sunrise is so beautiful that I don't know how to

The morning sunrise is so beautiful that I don't know how to The math problem is so difficult,I don't know __ A how to do The work is so difficult.I don't know____ A,how to doB.how t The maths problem is so hard,I really don't know ____.A.how So heavily____ that I didn't know how to go to the work. The homework is so much that I don't know what _____ Slowly to know that the reality so helpless.Love i don\'t i don't know how it began,that is the story 这歌歌名是什么? I don\'t know how to love you,missing you is the only way i I don't know how to love you,looking at you is the only way I don' t know how to love you.Looking at you is the only way The problem is very hard,I don't know how to work out._____