What are you doing here now? —- I’m thinking _________ chatting with my good friends.

The pay phone is _____Green Street and it’s across ______ the library.

__________ volunteers will be needed for 2014 International Horticulture Exposition (国际园艺博览会) in Qingdao.— Let’s go and join them.

Timmy goes to school _____ every day. It’s 5 minutes’ walk from his home to school. [ ]

Young people think it _____ great fun to surf_____ Internet.