--- Did you turn off the lights before you left the computer room? ---- Oh, I forget _______ them off. I’ll go to do it.
.Who did the manager of the company ________ the report?
Australia is such a splendid country that we’ve decided to stay for _____ two weeks.
_____ a certain doubt among the workers as to whether he could finish the task in a short time.
_____ he met with the terrible difficulty did he realize the importance of my advice.
Knowing _____, as a matter of fact, one shouldn’t know is a terrible thing.