The teacher set such difficult problems ______ nobody could work out _____ none of us passed the test.

It’s his brother __________ never been to Australia. You’d better take him with you.

I was____late to catch a bus after the party,and wecalled a taxi

Young people who have got jobs may realize university lessons can’t be the only preparation for all of the situations ________ appear in the working world．

_________ my homework, I went to bed.