The trips usually start on Friday night and end on Saturday night, ____ them practical for students and workers.

Mary ______ my letter; otherwise she would have replied before now.

Hardly had we got the project completed before the deadline when I _______ that a group of experts would come to _______ it. But to my disappointment, the so-called experts seemed to be totally amateurs to me. [ ]

______ on the top of the tower, and you can see the whole city.

Could I ask you a rather personal question?—-_________