Everyone has periods in their lives ______ everything seems very hard.

My brother，______ his classmates often made fun a few years ago，is now studying in England．

A new study shows older men          a lack of deep sleep are nearly twice as likely to develop high blood pressure.

There is a new problem involved in the popularity of private cars __________ road conditions require __________.

Men are more suited to occupational environments __________ require decisive action whilewomen are better at jobs __________ a considered approach is most important.

The old town has narrow streets and small houses _______ are built close to each other .

The way ______ was thought of by him ______ the experiment was similar to the way _____ you carried it out.

The reason       he didn’t go to school yesterday was       he was ill．

After living in Paris for fifty years，he returned to the small town       he was raised．

Jim passed the driving test , ________ surprised everybody in the office.