--Mom, these are my friend Peter and __ brother Bill.--Welcome to our home. Come in, please.
Mr. Li will go to Guangzhou by air. His workmates are ______ at the airport.
The computerin 1946 in America.
—Why are you so happy today? —Because I to London with my parents tomorrow.
The policeman told us __________ the street when the traffic light was red.
—You should ________ your son. He works harder than before. —Thanks, I will.