—Which module is the most difficult in this book?— I think _____ module.
He wrote a letter ________ he explained what had happened in the accident.
The days are gone______physical strength was all you needed to make a living.
Happiness and success often come to those ________ are good at recognizing their own strengths.
He may win the competition, ________ he is likely to get into the national team.
There is no simple answer,________ is often the case in science.