Creating world peace is a rather difficult goal, ____ calls for efforts of many generations.
___________ in hard seats for 6 hours, we finally stepped out of the train tiredly.
Our house is on the top of the hill, and in winter the winds ________ be very cold.
Molly is an impressive photographer, _______ pictures have appeared in many magazines.
John brought over my letter _______ to him by mistake.
_______ here if you want to get a better view of the mountain scenery.