[ Simple Present Tense ]
I______ know the correct answer.
A. am not
B. not
C. don’t
D. doesn’t

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Vocabulary › Viewshow changes in a setting over time
A. theater
B. drama
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At present, timberlands cover 30% of the area, but wooded areas are being lost ____ a regular basis because people are looking for homes, food, and materials.
A. by
B. with
C. at
D. on
