Hello, my name is Qin Long. I'm a student in 1big school. There are2buildings in it.

    Two classroom buildings 3on the left of the office building. My classroom is in the red classroom building.  4is next to the brown classroom building. On the 5 of the office building are the 6 and the sports hall. There are lots of books in the library. I7there on Thursday afternoon.I play basketball 8.I go to the sports hall on Friday afternoon.9 is behind the sports hall?The dining hall.We10there.The food is delicious.

设$0<x<\frac{\mathrm{\pi }}{2}$，则“$x{\sin }^{2}x<1$”是“$x\sin x<1$”的（     ）