______ can help us learn ______ about the world.
— Look, the man looks like Mr Green.— It ________ be him, for he ________ America since last week and hasn’t returned..
You mustn’t throw them about _________you use these plastic bags.
—Would you like to go ______for a vacation? —Yes ,I’d love to .
—Which man do you think is most likely to win the competition?—The man_________ Mr White.
It’s reported that _____ of the police ______ sent to search the robbers.