You’d better come back earlier _______ it is getting colder.
Whatever happens to you, you should be ______ about the future life.
---Can you tell me who the woman going to the hall is?---A famous writer ______to give us a lecture.
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.