The students _______ busily when Miss Brown went to get a book she _______ in the office.
---Did you hear the quarrel just now? ---________ I did.
She remains optimistic (乐观的) in spite of so much hardship she has _______ .
Doing morning exercises _______ our health and we _______ it.
I won’t have anything like that _______ in my class .
I love to buy a new dress at a _______ at the Spring Festival.