Many things that were once considered useful and _____, for example, tobacco, is now thought harmful.

Someone wants you on the phone．-— _____nobody knows I am here.

It is difficult to tell exactly ____ the saying began, but it is probable that it was in the theater or movie industry.

I find it astonishing that he ____ be so rude to us. I _____ make a complaint to his company.

Ifyou are in high spirits, you have a good _____.