—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
He sat at the desk, __________ a novel.
______ tourism developing, more and more people prefer to go travelling for a holiday.
.--- I was lucky the win a gold medal in the800-metre race.--- You ____ through hard training.
—Excuse me, Dad, but I’m going to the club to meet my friends in the football team.—OK. ______
You can’t complain of being lonely you don’t make any effort to meet people.