user-avatar
Cutiepatodie
2 năm trước
51. You (receive)………………….any letter from your parents yet? 52. My brother (join)…………the army when he (be)……….young. 53. I (see)……. a car accident while I (wait)………..for you at this corner yesterday. 54. Mr.John (be)………..principal of our school since last year. 55. Mr. Smith (teach)…………….at this school since he (graduate)………………..in 1990. 56. My father (not watch)……….TV every night. 57. I (meet)…………………. Arthur 3 weeks ago. 58. Yesterday the police (report)…………that they (capture)……………………..the thief. 59. My friend (thank)…………………me for what I had done for him. 60. Someone (steal)………….. my handbag on the bus giúp mk với
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

The forests of the tropics produce a magnificent growth of trees, but commercial lumbering is inhibited by problems that increase the cost of removal. The proliferation of species that is common to all tropical forests creates difficulties because many species are worthless. The lumberman combs the forests, therefore, removing the valuable trees that are convenient to waterways, and floating them downstream to a saw-mill. Unfortunately, tropical hardwoods tend to grow slowly; an area once cleared needs substantial time to recover, forcing the saw-mill to become mobile. Distance to market tends to be considerable, raising costs of the high costs associated with production. Other trees are left untouched. 1. What is the main topic of the passage? A. The growth rate of hardwoods B. The transportation difficulties C. The number of useless trees D. The high costs of commercial lumbering in the tropics. 2. The word “valuable” in line 4 means­­­­­­­­­­­­­­­­­­­­­_____________ A. precious B. important C. major D. useless

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team