_______ is very important for us students to learn English well.

It happens in plants when gardeners take cuttings from growing plants to make new           . 

--Have you got a digital camera?---No.---You should buy________.

—Who is ________ English teacher?—Well, it's Mrs.Green.She teaches ________ English very well.  

The grain output is 8 percent higher this year than _______ of  last  year.