We can’t be successful _____ we keep on working hard.—I agree with you.

My little cousin enjoys ________ picture books before he goes to bed.

Not until the train pulled into the next station _____ her suitcase gone.[ ]

________ the alien was in the museum, Icalled the TV station.

One of the National Health Regulations is that public schools ______ actively create conditions for sports facilities opened to the public.