Listen! Is Kate playing the piano in the room —No. It _________ be her. She has gone to London with her parents.

Is there _______________ to sleepfor half a day

________ some pennies, I think there are only nine pounds left in my pocket.[ ]

Beckham stopped playing soccer ______ his badleg.

下列句中加点的“于”用法和意义解说正确的一项是（　　）①仲尼岂贤于子乎　②于斯三者何先　③躬自厚而薄责于人　④君子之至于斯也