—What are you doing, John? Why stop?—To be on the safe side, we’d fill up the car now for we _______ run out of gas on the way．

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

We could have arrived earlier, but Tom insisted that I _________ too fast.

If you had not helped them, they ______ in London now.

 My demand is that the information referred to in my report _____ to Mr. Brown without delay.