The building project ______ next year is, I think, not easy ______ in time.

You can hardly imagine the difficulty Mrs. Jones had ________ up her children.

A sheep_______on this kind of special grass usually grows much faster than_______on ordinary (普通的).

     necessary experience for my future career, I take an active part in social activities in college.

(2010·福建高考)In April, thousands of holidaymakers remained ________ abroad due to the volcanic ash cloud.