Do not let any failures discourage you, for you can never tell______close you may be to victory.
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.
To her disappointment, what she had devoted herself to ________ in nothing but failure.