The exercises which we are doing ______ very difficult.
Đáp án C
Câu hiện tại đơn: nói về sự vật sự việc ở hiện tại
Which of the followings is NOT an evidence of monitoring studying?
Our flight was delayed, but the plane finally _______shortly after midnight.
According to the passage, to learn new information, low-achieving students do NOT______.
Which of the followings is the flow of water from the ground to the surface?