24329020088176641368

the show was interesting to the boys

- The boys felt ...

the last time she went out with him was 2 years ago

- She hasn't ...

Ba said, " I am going to meet your sister in front of the station, Liz"

- Ba told Liz that ...

- Tan began to collect stamps in 1999

Tan has ...

- We began to study E four years ago

We have ...

- It's long time since we became close friends

We have ...

1.b

2.d

3.a

4.b

Cho cấp số nhân u n , biết u 1 = 2 ; u 4 = 54 .  Tính S 10  là tổng của 10 số hạng đầu tiên trong cấp số nhân đã cho?

A.  S 10 = 118096

B.  S 10 = 59048

C.  S 10 = - 59048

D.  S 10 = 29524