Make a note of the questions you want to ask when you revise your lessons. ______ , you will surely forget some of them.

They ________ to enter the building by the back door; however, the front door was locked

I know a little bit about the city as I __________ there for one year in my youth

Mr. Smithworks as a government official now, but he ________in a middle school for 5years.

w technique ____, the production as awhole increased by % percent last year.