小题1:Do you mind introducing yourself to us?
小题2:Each of us / we each has got a chance to make a speech.
小题3:You’d better not spend all your spare time chatting online.
小题4:I am afraid this singer is not as popular as hefore/ less popular than before.
小题5:If you are lucky enough ,you are likely to win a ticker to the concert./ If you are lucky enough. it is possible for you to win a ticker to the concert.