Question

请教各位英语高手，谢啦~~

1. Mr. Green has been to Sydney ( ) . That's why he knows well about it.
2. After the baby fell asleep, Mom closed the door ( ) behind her.
3. Pudong Airport is one of the ( ) international airports.
4. Human's walking in space tells us that nothing is ( ).
用以下词语的适当形式填空
two busy possible quite
顺便帮我解释一下，O(∩_∩)O谢谢

Answer 1

1. twice 两次
2. quietly 安静地，轻轻地
3. busiest 最繁忙的
4. impossible 不可能的
可追问，望采纳：）

Answer 2

第一个twice 格林先生已经去过悉尼两次了，这是他很了解悉尼的原因。
quietly
busiest
impossible

Answer 3

twice
quitely
busiest
impossible
我也不确定……

Answer 4

1,twice
2.quitely
3.busiest
4.impossible

Answer 5

1. twice
2. quietly
3. busiest
4. impossible