er becomes increasingly scarce in decades ______, water shortage will become a hot issue all over the world.

The students were sitting in the classroom with their eyes ________ on the teachers.

___the right kind of training , these teenage soccer players may one day grew theinternational stars.

Why not play the music we listened to to yesterday?—-Because it _____old times.

The latest car must have cost you lots of money.-Oh,no,it ______.[ ]