关于数字的英文问句!十个!六年级的或以前学的.今天,最好马上啊!

1.How old are you?
2.How many students are in your class?
3.How long haven't we seen each other?
4.How often do you come to China?
5.How many birds are in the sky?
6.How many pens are in your pencilbox?
7.How many days will you spent in China?
8.How many empolyees are in your factory?
9.How much is the pear?
10.What is the weight of these apples?