—She looks very happy. She ________ have passed the exam.—I guess so. It's not difficult after all.
Martin’s gone to ______ the children from school.
______ the ______ of buying a house, it costs little to rent a house.
The volunteers try to convince people _____ the fact that some species are in danger of _____.
Across the river _____.
_____ all the demands had been refused _____ to go on strike.