______ at my classmates' faces, I read the same excitements in their eyes.
A. Look
B. Looking
C. Looked
D. To look
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He sent me an e-mail, ______ to get further information.
A. hoping
B. to hope
C. hoped
D. hopes
______ from heart trouble for years, Professor White has to take medicine with him wherever he goes.
A. Suffered
B. To suffer
C. Suffering
D. Suffers
______ his key, he couldn't enter the room.
A. Having been lost
B. Lose
C. He had lost
D. Having lost
______ in the hall for half an hour, the old man suddenly realized he had left the wallet in the car.
A. Having waited
B. Wait
C. To wait
D. Being waited