This problem may lead to more serious ones if ______unsolved.

He often takes the time ________ summer holidays with his grandparents .

．It was the four years from 2004-2007, ____ I spent studying for a master’s degree, ____ I will never forget．

Susan with her parents ________ the yard when I saw her.

______ made Daisy wild with joy– Her success in the A-level exam this year