Taken good care of by the students, the young trees are growing taller and taller ______ [ ]

Over a hundred children ______ parents were killed in the Wenchuan earthquake have been adopted and taken good care of by kind­hearted couples.

Li Ming often plays basketball to keep .

— Look!Somebody ________ the sofa.— Well, it wasn’t me. I didn’t do it. [ ]

下列各句中，加点成语使用正确的一项是