用所给词的适当形式填空

1. —How many ______(sheep) are there on the hill?

    —Twenty-one.

2. The ______(leaf) on the trees turn yellow when autumn comes.

3. We should do morning exercises every day to keep ______ (health).

4. —Can I help you ?

    —I'd like two ______ (kilo) of pork .

5. My friends and I go swimming ______ (two) a week in summer.

6. ______ (卷心菜) are my favourite.

7. Millie likes to have a bowl of ______ (汤) before meals.

8. It's not a good habit to go to school ______ (没有) breakfast.

9. Best ______ (祝愿) to your parents .

10. Jane and Linda want to be ______ (舞蹈) when they grow up.  

如图是以极点为中心的俯视图，虚线圈是极圈，AB是晨线，CD是日界线。读图回答下列问题

极点是（）（南或北）极点。此刻北京时间是（）月22日（）时。