设二次函数y=x²+bx+c，当x≤1时，总有y≥0，当1≤x≤3时，总有y≤0，那么c的取值范围是（　　）

个位上是____的数，都是2的倍数；个位上是____的数，都是5的倍数．(从小到大填写)

    Hello ,my friends.I 1_free this Sunday. We have no classes. I would like 2 out tor a picnic with my family on the farm. My mother and I do some shopping3 the morning. My mother buys some4,like bread and chicken . I buy5bags of milk. A bar of chocolate needs 11 yuan , but I buy five 6 50 yuan. Bananas are my7 I take a lot of bananas with 8.On the farm we see many rabbits. They are very9.I like them very much. We are all 10  on that day.

下列航海家在探索新航路的过程中，最早取得突破性成果的是