THE ENVIRONMENT PRACTICE TEST 1I. CHOOSE THE WORD OR PHRASE THA...

7. - 200 CAU TRAC NGHIEM KQ ANH 9 -BAI 6-7
200 CAU TRAC NGHIEM KQ ANH 9 -BAI 6-7

7. We are ready __________ the environment.

a. clean

b. to clean

c. cleaning

d. cleaned