How long is it ________________ we last had a picnic together?
—Which of those T-shirts do you like most? —________ of them. They are both nice and comfortable to wear.
Traveling is ______, but we often feel ________ when we are back from travels.
________ from his looks, he is a kind man.
______ that it was going to snow, the climbers decided to put off their attempt on the highest peak.
He sent me an e-mail, _______ to get further information.