Câu trả lời:
American students take part___________ different activities after school.
A. at B. on C. in D. for
17. Nam is interested in___________ experiments in his free time.
A. do B. does C. to do D. doing
18. Some students___________ blindmans bluff in the school yard now.
A. are doing B. are playing C. is doing D. is playing
19. Howdo you go swimming after school?
A. many B. much C. often D. far
20. We study different countries and their people in ___________.
A. Literature B. History C.Geography
mình thấy câu 20 thì chỉ có 2 đáp án nhưng đáp án nào cũng ko đúng nên mình thêm vô. Sorry nếu có gì không ổn