－ What does the sign over there say?－ “No person ____________ bring drinks into the student computer pool.”

He commanded the students ______ the classroom before he returned.

_______ he had not hurt his leg, John would have won the race.

Jane’s pale face suggested that she______ ill, and her parents suggested that she      medical examination.

--The mistake_____, I had been more careful.---But you weren’t at that time.