— I can’t find my dictionary anywhere.— You _____ have lost it while studying in the library.
—I need some fresh air, so I'm going out for a walk.—________.
The discovery of new evidence led to________.
—We need to buy some summer clothes, John.—Oh, I never know ________when I'm in the store.
—Isn't Miss Brown here yet?—No.________, she's not here yet.
The temperature is high enough ________water into vapor(蒸汽).