She ____ have left school, for her bike is still here.
I have no idea ______ it is that makes him puzzled.
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. ______