A survey of the opinions of scientists _____ that three hours of outdoor exercise a week _____ good for our health.
. The government doesn’t know how to deal with the dangerous situation all the public are aware of at present.
. 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.