13. Why size of the window frame is wider than usual?

a.     To provide expansion space for the glass when it's hot.

b.     To making glass cracking.

c.     For decoration.

d.     The glass will look biger.

14. Why glass filled with hot water suddenly breaks?

a.     Because the glass melt.

b.     Because of the uneven expansion of the glass.

c.     Because glass is getting hotter.

d.     Cracking class.

15.  The students usually have flag ceremony on ....

a.     Sunday

b.     Friday

c.     Monday

d.     Saturday