It’s not doing the things we like, but liking the things we have to do makes life happy.
He was obliged to ______ the trade of shoemaker.
The government of the United States began at once to investigate the case ______ a lot of students were killed.
---I probably shouldn’t have any more cake. ---Oh, ______. It won’t kill you.
It is ten years since the scientist ______ on his life’s work of discovering the valuable chemical.
--Her father is very rich. --- ______ She wouldn’t accept his help even if it were offered.