I don’t knowwith this problem．It’s too hard．

In the US, students can do almost anything they want in class, ____ they don’t make too much noise or disturb others who want to learn from the teacher

______ he has been so rude to us, I feel like we have to punish him or he won’t respect us

Does Bill do his new job well?　　　　— ________ his old job. I’m afraid there’s no hope for him.

Hou Yi was ______ sad _______ he called out Chang’e’s name to the moon every night.