永远不要为了结交朋友或保持友谊而做一件错事.
Never do a wrong thing to a or keep one.
Karl Marx began to learn another foreign language in his (fifty).
The flight ( cancel) because of the bad weather last week.
Linda (sleep) on the bed when the doorbell rang.
My cousin will go to university for (far) study.
I would like (invite) you to my birthday party.