26. —How about buying Sam a mobile phone? After all, he isn’t a boy any more.—I think it’s necessary, for we sometimes want to make sure if he ______home for dinner.
The kind lady devoted all her life to _____ those homeless children.
A large number of people are _____, and how can the local government ignore the problem?
—Could I use your computer for a few moments, please? —. I’m not using it myself.
—Have you ___________? —No. I had the wrong number.
Mary went to the box office at lunch time, but all the tickets ____out.