a.         chiếm 3/4 hoc sinh

b.         3 tổ có 24 học sinh

Nếu đúng thì tích cho mk nhe !!!!!

Đáp án : 220

The Present perfect or the Past simple ?

1.(be) I ________HAVE_____never_______BEEN________in jeans

2.(visit) They_____VISITED_______My Son Tower two days ago

3. (do) I_____HAVE DONE______all the washing recently

4.(be) Where_____WERE_______you the day before last? -I______WAS_____in Hue

5.(produce) They_____HAVE PRODUCED______two thousand jeans so far this year

6.(not go/be) I______DIDN'T______to school yesterday because I_____WAS_____ill

7. (move/live) I_____MOVED____to this city in 2005. I___HAVE LIVED_____here since then

8. (know) I_____KNEW_____her when I moved to this neighborhood

9.(know) I______HAVE KNOWN_____her since I moved to this neighborhood

10.(wear) I need another pair of jeans. Mine______WORE_____out