【2014年山东省临沂市中考】When you are swimming, ________ your ears. You can use earplugs (耳塞) to stop water getting into your ears.
I don’t know _____ yesterday.
—Wow! Your school is so beautiful! —Thank you! It _____ last year.
The teacher told us _____ to the recorder and read the dialogue three times.
Although they were tired, they still went on _____.
_____ you tell me how to use this digital dictionary?