Linda’s mother looks young, but actually she is in her       .

A new study proves a         walk every day is enough to keep people away from becoming fat.

根据提示填空（每空一词）
这条河有两米深。
The river is ____ ____ ____.

写出下面英文数字对应的阿拉伯数字
five billion, one hundred and thirty thousand, and one____

Could you tell us how to read the number 307, 019,498?

About         of the workers in the factory were born in the       .

—How long is the bridge?
—It’s       .

In this test, we’re asked to write a passage of about       .

—It’s convenient to travel from Ezhou to Wuhan by taking the newly-built green railway.
—Yes. It’s said that       is enough.

It’s never too old to learn. Karl Marx began to learn English in his       .