Of the three girls, Mary sang             

—Stephen, did you visit Nanjing Confucius Temple the day before yesterday?—No, I didn’t go there as you told me. ______, I went to Jiming Temple with my parents.

 ----Where is my watch? I can’t find it.----Don’t worry. It must be ______ in your room.

— _________ has Liu Xiang taken part in world’s competitions of 110-metre hurdles?— I’ve no idea. Let’s find it out on the Internet.

Bicycling is a good exercise;________ it does not pollute the air.