After ten years abroad, he still recognized his old colleagues ________ he set foot in China．

The boys are doing no harm; they are ___ playing．

It turned out that one of the children I thought a girl was _______ a boy.

------So you gave her your phone?------_____, she said she’d return it to me when she could afford her own.

—I’ll talk to my son Bill about it as soon as possible． He usually listens．—We need _______ listening． We need action．