“Attention, please. Whoever can answer one of my questions______ receive a prize”, the teacher said in class.
--- What happened to you? --- I was lost in the strange city; _______, it began to rain heavily.
Things came ______ after that. And now he has ______ student in Nanjing University.
Flight attendants usually need to arrive at the airport ______ before their flight leaves.
--- Who are you waiting for? --- ______ us a lecture this afternoon.
It was ______ he was part of Manchester United’s Youth Team, ______ won the FA Youth Cup in 1992, that David’s success started.