________ you’ve heard the song, you’ll never forget it.

am really worried about his grades in the coming test because of the little use he _____ of his spare time before it.

Of the two sisters, Betty is______one, and she is also the one who loves to be quiet.

I became a teacher ten years ______. I have been a teacher _______ 2008.

(2009江苏四市联考) By nine o’clock, all the Olympic torch bearers had reached the top of Mount Qomolangma, ___________ appeared a rare rainbow soon