题目内容：

    Nice to meet you！My name is Robert Green. My mother Emma has two daughters, Maria and Selena, and a son. I’m a middle school student. My mother is in my school, too. Her classes are very interesting. And she is nice to her students. So they like her very much.

Here is a green schoolbag on the desk. Is this my schoolbag? Yes, it’s mine. What’s in it? A student card, two English books and a jacket are in it. You can find an English dictionary in it, too, The dictionary is not mine. It’s Maria’s. Is this yellow pencil box mine? No, it’s Maria’s, too. Her favorite color is blue. You can see some keys, a blue eraser, two black pencils and a blue ruler in it. What are these? They are two baseballs. One is white, and the other（另一个）is blue. The white one is mine. The blue one is Selena’s. Whose black watch is it? Oh, I see a name “Henry” on it. Henry is my good friend. I can call him at 065-66558765.

1.How many children（孩子）does Emma have?

2.What is Emma’s job（职业）?

3.Is the yellow pencil box Maria’s?

4.What color is Robert Green’s baseball?

5.Whose black watch is it?