Edgar began（）as an office boy years ago.
The museum（）we visited last Saturday was set up twenty years ago.
A long time ago, I（）in London for three years
More than 30 years ago, （）that the region was rich in natural resources。
4. In Aymara, we may say “behind 20 years” to express “20 years ago”.
Mary _______ in London two years ago.
Tom _____________(work) there since two years ago.
Scientists believe that a large meteor hit the earth thousands of years ago.
Fifty years ago, wealthy people liked hunting wild animals for fun ________ sightseeing.
4. Is this the factory _____ he worked ten years ago?
Is this the factory ______ he worked ten years ago?
Galileo Galileis experiment at the Tower of Pisa around 400 years ago
A water system for baths was built by over 3000 years ago（）
Two hundred years ago, news between the continents was carried______.
My father （)work in China years ago.
Life was not easy for many children livin9 100 years ago．
－－－ Where did you go for your holiday？－－－ Two years ago.（)
Which two rings show the weather 12 years ago？
The town was_______after fifty years.
The formation of Isua supracrustal belt was 8 billion years ago.
请就听到的内容作答______。 A) 3.3 billion years ago. B) 2.9 billion years ago. C) 1.2 billion years ago. D) 2.1 billion years ago.
That factory has been built nearly 50 years ago.（）
That factory was built nearly 50 years ago.（）
This famous temple is believed___about 800 years ago.
