The manager says he needs an assistant to ________ to deal with the problems that may occur in his absence.[ ]

Much to our relief，his disease turned out to be ________ than we had expected.

All of us must do_______ to help protect the environment，or we will have more hazy weather雾霾天气.

_______ worries the public a lot the way thestudents are getting more and more stressed out

It is difficult to imagine his ________ the decision without any consideration. [ ]