Giúp mk từ câu 43 -> 50 với!

38. A. which B. who C. when C. This is the battle field where the soldiers fought. D. This is the battle field where the soldiers fought there. 39. A. Before B. After D. where C. While 40. A. lives B. life D. When C. live 49. They can't work and travel. They are old. A. Because of thei ...