After having finished mopping the floor, he puts the mop back ______ it belonged.
With oil price going up all the time, people _____ to pay more for travelling.
We expected _____ no problem with the publication of the book by now, but is still being printed.
Sometimes we believe what we see _____ the reality may be different.
The women carrying babies, come in first, _____?
We can live without clothes, but food and drink are _____.