I had ______ him to give up the job, but he didn’t take my advice.

The roots of such plants can easily ________ water and guarantee the growth of the plants.[ ]

In western culture,21 was the age________ young people traditionally received a key to their parents’ door, as a symbol of entering adulthood.

George Washington was born in 1732 in arich family in _______ is now the state of Virginia.

ptember 2008 , China’s key milestonein space travel_____when Zhai Zhigang conducted the first space walk