请根据句意从方框中选择合适的单词，并用其适当形式填空，使句子通顺。
小题1:Elephants eat________, but they can move silently.
小题2:Food __________is very important for children.
小题3:She is ____________ among these girls, but she is still on diet.
小题4:A lot of people are having a party for the old lady’s __________ birthday.
小题5:—Is this your sister’s handbag? —No, it isn’t.. __________ is on the chair behind the desk.
