Hobbies are _______ in helping patients recover _______ physical or mental illness.
. Don't bother Tom, he is with the experiment on water molecules in the lab.
It’s____ comfort to know that so many people are donating money and food to the people in need.
_________ the project in time, the workers were working at weekends.
. _________ many times, he finally understood it.
The chairman thought _________ necessary to invite Professor Smith to speak at the meeting.