----- Nội dung dịch tự động từ ảnh -----
Question 19. How many students
A. there is
C. there are
Question 20. Friction
A. were
C. are
Question 21. Odd one out:
A. evening
C. learning
in your class?
B. is there
D. are there
a force that holds back the movement of a sliding object.
B. was
D. is
B. writing
D. playing