On a peaceful summer day, he went to swim in the sea _____.
Various _____ of electric fans are now on display in the shop windows.
E-mail is a valuable _____ for college students at any level.
Lin Fang won first prize in the English contest and her efforts at last _____ .
People _____ a long queue to buy the ticket for the concert.
—Which one of these shirts would you like? —__________. Either is OK.