The best times to visit Shangri-la are spring and autumn ___ the temperature is at its mildest.

Mo Yan, _______penname means “Don’t speak”, won the 2012 Nobel Prize in literature.

I don’t understand how you got a ticketI always ______ you ______ a careful driver

That hall is________ this one Let’s go to ________ one

There is _____ pollution in the world. Wemust stop it.