—Why didn’t you finish the task? —I didn’t think it is ________ the effort.
Peter is my close friend, who can be what he promises.
. Although the prices of TV set are , he managed to make the manager the price of that TV set.
The discovery of how bronze is made was probably accidental, but it to be an important event.
Mr. Smith had taught for many years, and all the students him.
Please the invitations as soon as possible.