听材料，回答问题。
（1）How many students are there in their class？
A.19.
B.20.
C.39.
（2）How old are the students？
A.12 or 13.
B.13 or 14.
C.14 or 15.
（3）When is Grace's birthday？
A.In September.
B.In October.
C.In November.
（4）What do they have in December？
A.A ball game.
B.A book sale.
C.An art test.
（5）When is school over （结束）？
A.In December.
B.In January.
C.In February.