He started walking when he was _____.A. 2-year-old B. 2 year old C. 2 years old
–Will the air in our city get cleaner?–_______. Everybody likes clean air.
My grandmother is ill, _______ I have to look after her at home.
There are _______ foreign students in the class. Two are from the UK, three are from Australia and the other six are from Canada.
Mr. Jackson likes to have _______ cup of coffee in the morning.
My uncle is a doctor. He sometimes has to work _______ night.