Father made a promise _______ I passed the examination he would buy me a bicycle.

Wind power is anancient source of energy _____ we may return in the near future

Scientists are convinced __________ the positive effect of laughter _________ physical and mental health.

Read this story, _______ you will realize that not everything can be bought with money

Of the two dresses, I’d like to buy_______ one to save money for a book.