Water, which seems so simple and common, is _____ makes life possible.
______has helped to save the drowning boy is worth praising.
.She listened with a________expression on her face,which suggested she didn’t completely understand.
The professor gave orders to the students that the rest ______ before 5:30.
Generally speaking, the music of one country is quite a lot in ______ with its culture.
______ the danger from enemy action, people had to deal with a severe shortage of food, clothing, fuel, and almost everything.