1.In 1990,it ___ more than five billion.2.Now at the beginning of the 21st the world's population ___ six billion.3.four hundred years ago,the number___over 500 million.用reach 、pass 、be 填空.尽量不要用重复的词填空.
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1.In 1990,it ___ more than five billion.2.Now at the beginning of the 21st the world's population ___ six billion.3.four hundred years ago,the number___over 500 million.用reach 、pass 、be 填空.尽量不要用重复的词填空.
1.In 1990,it ___ more than five billion.
2.Now at the beginning of the 21st the world's population ___ six billion.
3.four hundred years ago,the number___over 500 million.
用reach 、pass 、be 填空.尽量不要用重复的词填空.
1.In 1990,it ___ more than five billion.2.Now at the beginning of the 21st the world's population ___ six billion.3.four hundred years ago,the number___over 500 million.用reach 、pass 、be 填空.尽量不要用重复的词填空.
was
has reached
was
1.In 1990, it _reached__ more than five billion.
2.Now at the beginning of the 21st the world's population _passes__ six billion.
3.four hundred years ago, the number_was__over 500 million.