The population problem may be ___ one of the world today.
As is known to us, knowledge iscan change your life.
the situation become worse, call me at once.
--- Remember the trip? The scenery there is really breathing-taking. ---Yeah.We also reallya good time.
With the car _____ down halfway on the road, we had great difficulty walking home in the snow.
the sound of the terrible noise, the little baby burst into tears.