She devoted herself entirely _____ helping the children who suffered a lot in the earthquake.

The zoo worker told the visitors that in the case of a highly ________ animal, performance training iseasy and not so painstaking.[ ]

Hey, Mike. An Indian man recently sang for 80 hours straight, setting a new Guinness world record.—Really? It’s really a(an) __________ feat(本事).

Mr Wang didn’t come , so Mrs. Wang ______ .

The income of skilled workers went up. ________, unskilled workers saw their earnings fall.