With the teacher's words________ in their ears, the students worked hard at their schoolwork.
A. ringing
B. to ring
C. rung
D. rang
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With so much work ________ my mind, I almost break down.
A. filled
B. filling
C. to fill
D. being filled
The needle treatment ________ back to the ancient times has cured many diseases.
A. to date
B. dating
C. being dated
D. dated
Snow was falling when they went along a mountain path __________ to the front.
A. to lead
B. led
C. leading
D. being led
___________ its size with that of the whole earth, we find the highest mountain does not seem high at all.
A. When compared
B. Compared to
C. To be compared
D. Comparing