His brother ___the army since 2012.
After the new method is _______, a lot of money will be saved.
He went down into the cold water and after ________seemed a long time, he came out.
Who is ______ you want to send to the front?
With two children ___middle school in the nearby town now, the parents are working hard.
--- How many students are there in the classroom? --- ______.All of them are practicing _____ the new song in the music hall.