We won’t give up ______ we should fail 10 times.

I often think of the days ______ I took part in the military training with the soldiers, _____ has a great effect on my studies.

Beijing government puts more than 700 million yuan to increase its green space this year; ____________ doubles the money provided last year.

_______ a pair of compasses, it is easy to describe a circle.

 The British are not so familiar with different cultures and other ways of doing things, ________ is often the case in other countries.