—He is eager to try something he has never tried before.—Oh, I see. That’s _______ he’s different from others.
It is generally believed that teaching is ___________it is a science.
It is always difficult being in a foreign country, __________if you don’t speak the language.
How are you getting on with your classates?——______. I’ve got to know them all.
We must keep our room clean, for dirt and disease go______, you know.
To their great relief, the missing child returned home, ______, after an absence of two weeks.