Từ ví dụ mẫu hoàn thành câu sau

Từ ví dụ mẫu hoàn thành câu sau:
Eg: My uncle / worked / this paper mill / 20 years.
My uncle has worked in this paper mill for 20 years.
They / been waiting / bus / thirty minutes.
They have been waiting for the bus for thirty minutes.
Practice test