The importance ______ a national day andhow it is celebrated are very different from country to country

After a long walk from the lake to the school, most of the students went back to the classroom, __________.

Although all of the apples _______, none of them _______ good.

The volleyball match will be put off if it_____.　

Sweet memories ________as I looked at the pictures which were taken at the beach last summer.[ ]