29. He did a lot to conditions for factory workers. (improvement)
30. Doctors and have reported on how we are all affected by the noise around us. (science)
31. You don't have to do that work. In other words, it's for you. (necessity)
32. A good student must know how to study (effect)
33. Her piano teacher only teaches not people of Grade 3 and above. (begin)
34. The river is mainly by smaller species of fish.. (population)
Loga
Sinh Học lớp 12
