But for their help，we ______ the program in time.

There was a traffic jam; otherwise I ____ here on time.

Mark_______have hurried. After driving at top speed .he arrived half an hour early.

 It is required in our school that lights in students’ rooms ______ off by 11o’clock.

The professor ________at 8 o’clock，but he has not shown up yet，which worries all of us.