Some people are worrying about the possibility ________ mobile phones could be responsible for a range of illnesses, from rashes(皮疹) to brain tumors．

_____ the drought in Southwest China, millions of people had to carry water from faraway places.

We’ll go to the farm and help the farmers with the apple-picking if it _____ tomorrow. [ ]

_____is he staying here?— For a month.[ ]

fantastic documentary it is!– Do you mean the hot film “Diaoyu Island—-The Truth”?