a ... of matches 
a ... of toothpaste 
a ... of toilet paper 
a ... of biscuits 
a ... of flowers 
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a ... of oil 
a ... of jam 
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a ... of bread 
a ... of fish 
a ... of chocolate 
a ... of lemonade 
a ... of margarine
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ELEMENTARY:
Nature
Food
Fruit
Vegetables
Pets
Domestic animals
Wild animals
Colours
Toys
Flat
School
Clothes
Numerals 0-100
Holidays
London
Travelling
Containers
Verb forms
INTERMEDIATE:
On the beach
Sea animals
Means of transport
Insects
Australian animals
Trees
Flowers
Tools
In the Kitchen
Christmas
Halloween 1
Halloween 2 Zodiac signs
Sports
Plants
Animal sounds
Holidays
Languages 1 (small)
Languages 2 (large)
European languages 1
European languages 2
Famous Writers
Jobs and occupations
Jobs (small)
The Earth
Shops
Health and Medicine
Character traits
The USA
The USA 2
Canada
Musical instruments
Birds
Human body
Theatre
London