----- Hi, Tracy, you look tired. ------ I ________ the living room for three hours.
They _________ have arrived at lunchtime but their flight was delayed.
The year 1949 ________ the birth of a new country—the People’s Republic of China.
He told us whether __________ a picnic was still under discussion.
Rather than _________ at home, he always prefers ________ out to play.
I’m going to visit the factory ________ your brother worked a few years ago.