Do you remember those days ____ we spent along the seashore very happily?
I lent him ten magazines, ____ are more wonderful than you can imagine.
It is silly of me _____ all eggs in one basket. That is the worst mistake I have made.
_________ to give up smoking, he threw away his _______ cigarettes.
Nowadays, ______ number of people doing fitness training is on _______ increase.
I think full advantage is _______ of this technology to improve the quality of our products.