________ he had not hurt his leg, John wound have won the race.
Mary ________ as a secretary in this company for twenty years and now she stays at home taking care of her own garden.
They ________ to go shopping in the downtown district, but they cancelled it because of a hard rain.
—Alas! I have left my key to the office in my car.—Don't worry. I ________ it for you. Wait a minute.
—Did you enjoy meeting your old schoolmates at the party last week?—Yes, I did. We ________ each other since we graduated from college.
Siberian Tigers ________ and killed at such a speed that they will disappear from the earth in the near future.