1.用数据_______
2.平均年龄_______
3.坐公共汽车_______
4.步行_______
5.四人一组_______
6.There is a long b____over the river.
7.We must do a follow-up s____ about the goods.
8.The t____is high in summer here.So it's hot.
9.Its w______is two kilogrammes.
10.An SPCA i____can care for animals.
11.When you cross the road ,you must be carful with the t_________
