There is no simple answer, _____ is often the case in science.
— Go for a picnic this weekend, OK?— __________. I love getting close to nature.
There was __________ time when the two countries were at __________ war.
—Dear, I can find a better job if I go to Germany, maybe.— Don’t be silly. ________, you know.
—Did your classmate accept your invitation?—No, he ____ refused.
In Scandinavian countries it is common ____ for the husband to stay at home to look after the baby.