Insert prepositions through, for, on, at, about and translate them into Russian:
1. We trudged home ___________ the snow.
2. Further effort __________ negotiations have broken down.
3. The sergeant was whining __________ how hard he had been forced to work recently.
4. She sat quietly, meditating __________ the day’s event.
5. The just-weaned calf bawled __________ its mother.
6. The dog sniffed _________ the visitor.