The children are talking about their families. Choose the correct word (a, b or c) to fill in the gaps in the sentences. There is an example (0) at the beginning.

(2p-3n)(2p+3n)-4p(p-n)= 4p^2-9n-4p^2+4pn=4pn-9n

3xy+3x^2y=3xy(1+x)
x(x-1)+2(x-1)=(x-1)(x+2)
x^2-25y^2=(x-5y)(x+5y)
a-ax^2=a(1-x^2)

==a-1

x(2x+14)=0
2x^2+14x=0
2x(x+14)=14
2x=0          x+14=0
x1=0          x=-14

(X-3)^2=0
x^2-6x+9=0
D=(-6)^2-4*1*9=0
x==3

(x-y)(x^2+xy+y^2)-(x+y)(x^2-xy+y^2)=x^3+x^2y+xy^2-x^2y-xy^2-y^3-x^3+x^2y-xy^2-x^2y+xy^2-y^3=-2y^3

остальное извини, у меня уже голова не варит :с 

Example 0:
My (0) __a__ sister is six years old.

Explanation:
In this sentence, we are talking about one sister, so we use the possessive adjective "my" before the noun "sister". Since "sister" starts with a consonant sound, we use the article "a" before it.

Now, let's move on to the main question:

1. His (1) __b__ are very kind.
a) fathers
b) parents
c) husbands

Explanation:
In this sentence, we are talking about more than one person who is related to "him". The word "kind" tells us that these people are most likely the parents. So, we choose the word "parents" from the options given.

2. Her (2) __c__ is a doctor.
a) sisters
b) brothers
c) mother

Explanation:
In this sentence, we are talking about one person who is related to "her". The fact that this person is a doctor suggests that it is most likely a female. So, we choose the word "mother" from the options given.

3. Our (3) __b__ are from Spain.
a) cousins
b) grandparents
c) aunts

Explanation:
In this sentence, we are talking about more than one person who is related to "us". The fact that we mention they are from Spain suggests that they are most likely the grandparents. So, we choose the word "grandparents" from the options given.

4. Their (4) __a__ are teachers.
a) parents
b) brothers
c) uncles

Explanation:
In this sentence, we are talking about more than one person who is related to "them". The fact that they are teachers suggests that they are most likely the parents. So, we choose the word "parents" from the options given.

5. My (5) __c__ are coming to visit.
a) sisters
b) brothers
c) grandparents

Explanation:
In this sentence, we are talking about more than one person who is related to "me". The fact that they are coming to visit suggests that they are most likely the grandparents. So, we choose the word "grandparents" from the options given.