1A

2C

3B

4C

\(M_X=3.5\cdot M_O=3.5\cdot16=56\left(\dfrac{g}{mol}\right)\)

\(X:Fe\)

1.My brother went ot France in order to learn French. 

2.She tries her best to study Math so as to pass the final exam

7B

8A

9C

10D

11A 

12A

13C

14B

15C

Nam promises he ………will study harder…………………………………………………….

He promises he………won't tell lies………………………………………………………

Đúng ấy em, môn Anh tới 4 cột thường xuyên lận :))

\(\dfrac{10+10+10+10+9.75\cdot2+9.33\cdot3}{9}=9.7\)

She’s stayed in USA for six months so that she can perfect her English