2. My mother is buying.... (a pork of kilo, a kilo of pork)
a pork of kilo.
a kilo of pork.

3. She is drinking (a cup of tea, a tea cup)
a cup of tea.
a tea cup.

4. There are a lot of (flies, flys) here.
flies
flys

5. My (aunt, uncle) is the sister of my father.
uncle
aunt

6. She wants (a soap of bar, a bar of soap)
a bar of soap.
a soap of bar.

7. Money (are, is) important for people.
are
is

8. I want to buy (a piece of toothpaste, a tube of toothpaste)
a piece of toothpaste.
a tube of toothpaste.

9. There is a (coffee, bottle) on the table.
bottle
coffee

10. There are not many (deers, deer) in this zoo.
deers
deer