Claudia, are you going to Jeff’s birthday party on Saturday-Unless I______ .

What did you say to Julia? I saw her crying in the dormitory alone.— It _____ my fault. We talked happily when I was with her in the classroom. [ ]

Who does that shop assistant think he is He behaves _______ he owned the store.

How should I deal with new words in reading? —Well, you’d better not stop　　　you come to a word or a phrase you don’t know

rvey shows that ______ we are enjoying less and less good sleep, rates of heart diseases have risen rapidly．