一.写出下列数字的英文表达。
1. 13（ ） 2. 15（ ）
3. 18 ( ) 4. 20 ( )
5. 17 ( ) 6. 12 ( )
7. 11 ( ) 8. 19 ( )
二.请找规律，在横线上写出正确的英文数字。
1.one, three, five,( ),nine.
2.four,eight,twelve,sixteen,( ).
3.fifteen,twelve,( ),six,three.
4.nineteen,seventeen,( ),thirteen,eleven.
三，翻译下列句子。
How many pens are there?
There are eleven square.
I can see sixteen birds in the sky.
I can buy nine apples in the shop.