Who did it?—.you ask?It was Joe,of course.

Did you listen to the lecture given by the famous herbalist doctor Zhang Wuben? — No, we ______ it. But we had a lot of traffic on our way.

The UN has warned that,_____ natural systems like forests and wetlands disappear , mankind is losing the services they provide such as protection from extreme weather

must have been a lot of work—Yeah, it usthree days to finish it

Let’s_______ the pandas.