-13-Years ago people began building and using factory ships.

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-13-
Years ago people began building and using factory ships.Such ships can c_____1_____ hundreds of workers who clean and package(包装) the fish as s_____2_____ as they are caught.With the rapid d_____3_____ of science,people are catching more and more fish.But sometimes they catch too many of them,so that some types of fish have almost d_____4_____.To make sure that there will always be p_____5_____ of fish for human in the years to come,s_____6_____ all over the world are trying to keep checking on the population of fish in different parts of the world,and many government have taken or are taking measures to p_____7_____ the fishing resources.
1.____________ 2.____________ 3.____________ 4.____________
5.____________ 6.____________ 7.____________

1 can carry 2 as soon as 3 development 4disappeared.5plenty 6 scientists throughout 7protect

A and B came to this factory two years ago David began to work in this factory 10 years ago(改为同义句） People began to use fire millions of years ago.对划线部分提问 I don't remember how many years ago ___ that people began to People began making clocks over 500 years ago .The first clo The building began to shake strongly and people ran wildly w Tom's father s___ this factory two years ago,and he made a l The factory opened ten years ago 同义词转换The factory opened twenty years ago.The factory ( ) ( ) I began to study here two years ago 同义句 We began to learn English two years ago.(Tom says) We began to learn English three years ago.