1 . After the exam, I felt an incredible sense of ________ (relieve). （所给词的适当形式填空）

2 . Believe it or not, crying is a useful way you can imagine ______(relieve) pressure. (所给词的适当形式填空)

3 . It was feared that food supplies would give out before the besieged (被围攻的) town could ______ (relieve). （所给词的适当形式填空）