Burning all the lights in the classroom will be a great______ on electric power.
30.______ the news that her son was still alive, tears rolled down the old woman’s face.
29.It will lead to very serious result if this matter was ______ unsolved.
28.I didn’t enjoy the party very much. I knew ______ nobody there.
27.After the adventure, the children returned home, ______.
26.— Do you have any idea what Paul does all day?— As I know, he spends at least as much time playing as he ______.