In summer milk will quickly go bad_____ it is put into a fridge.
They lived a hard life and were often made _______ for over ten hours a day.
The country has _____ several wars in the past century and people there are still living a poor life.
The English teacher told us this morning that we _____ an exam at the end of this month.
Some students cheated in the exam, which _____ our teacher deeply.
The most important thing is to keep _____ when you get into difficulties.