all

me

a)to have

b)reading

c)talking

d)cost

e)more interesting

1.two- months

2.care of the houes while we are away

3.two hours each day doing my homework

4.hard

5.have to the work today

6.had better wear these gloves

7.asbent last tuesday

8.this tv doing now

9.listening to music to watching tv

a+c+d+e

Trong không gian hệ tọa độ Oxyz, cho hai điểm A ( 1 ; 2 ; - 1 ) ,   B vectơ A B → 1 ; 3 ; 1 . Xác định tọa độ B

bang son