---How long will Tom stay here? ---____.
Friendship among the nations will _______the economic development of the region.
Most citizens like to go to the Wal-Mart Super Centerbecause it has a ______of items.
______clearly in class, Mr. Smith raised his top voice to ask his students to stop chatting.
____ by taking part in practice can the young people be toughened and hardened into steel
My house is located near the main street, so my family were____ upset by the outside noise.