. ---Why do you say that the doctor is in a _______? ---Because he doesn’t know whether to tell the patient the truth or not.

Opinions of that kind are best kept to yourself, and not voice＿＿＿＿＿．

Scientists have achieved a major ___ in the search for a cure for cancer, ____ is good news for those who suffer from cancer.

It’s foolish to go to the ___ of taking music lessons if you never practise.

In dealing with public relations，we should make every effort to prevent the_______in personality.