Neither side is prepared to talk to ____ unless we can smooth thing over between them.

 I would appreciate _____ , to be frank, if you can take care of my pet dog.

With the weather getting colder, visitors from Australia spent their ___ days in Beijing.　    

_____ is known to us all that the sun rises in the east.

Cars do cause us some health problems, in fact, far more serious ________ than mobile phones do.