The unfurnished room has no furniture, no decorations, just the four ______ walls.
A. bare
B. hollow
C. vacant
D. empty
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When ____________ , ice will be changed into water.
A. heating
B. heated
C. having been heated
____________ the cause, we were able to propose a remedy.
A. having found
B. to find
C. finding
Not _________her address, we couldn’t get in touch with her.
A. known
B. knowing
C. to know
_____________ by mistakes and setbacks, we have become wiser and handle our affairs better.
A. having been taught
B. teaching
C. to teach
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