Believe it or not, _____ did I hear it, but also saw it.

---- Your father is very strict with you.      ---- ____. He never lets off a single mistake of ours.

If ________ the same treatment again，he is sure to get well.

---Where did you fall in love with her at first sight? ---____was in a small villiage where my father worked.

We students should treasure the short senior school’s study life of three years. Once ________, the opportunity can’t get back.