1/The natural ………. of water is influenced by trees, grasses, and other plant life. The natural ………. of water is influenced by trees, grasses, and other plant life. A.round B. cỉculation C. suround D. road 2/: They _________________at work. A. allow not to be worn jeans B. are not allowed being wear jeans C. are not allowed to wear jeans D. do not allowed wearing jeans 3Nearly 1,000 of the world’s bird species are ………..with extinction A. warned B. known C. saved D. threatened 4/: Choose the word whose stress is place differently a. investigate b. information c. submarine d. independent 5/It is impossible to do this work. . a. It is impossible to be done this work. b. To be done this work is impossible c. Being done this work is impossible. d. This work is impossible to be done. 6/__________________ last year? A.Did this tractor buy B. Was the tractor bought C. Has this tractor bought D. Has this tractor been bought 7Choose the word whose stress is place differently a. disappearance b. circulation c. conservation d. environment