exercise 1:B G C F A E D H
exercise 2:fluently native vocabulary apartment elevator
exercise 3:come up ,At present,Because of,such as ,make use of,
exercise 4:in/on,at/on,past/after,in/on,from/than,in/on,
前面的是British En,后面的是American En
exercise 1:B G C F A E D H
exercise 2:fluently native vocabulary apartment elevator
exercise 3:come up ,At present,Because of,such as ,make use of,
exercise 4:in/on,at/on,past/after,in/on,from/than,in/on,
前面的是British En,后面的是American En