People aged 65 and over now contain nearly 20% of the population.

1) They usually take a bus to work, but they aren't taking a bus to work now. They walk to work today.

2) Mai often watches television in the evening. At this moment, she is watching a flim on TV

3) He isn't working now. He never works on Thursday

4) The doorbell is ringing again now. It rings very often

5) The train is stopping at the corner now. It always stops there

6) Sam and Peter usually sit in the back row, but I wonder why they are sitting at the front row today. ( Câu này kì kì:v )

7) My sister never goes to schooi late

8) They often have lunch in the factory canteen. Today, they are having luch at a restaurant

9) She is speaking French now, but she usually speaks Japanese. She always wants to practise Japanese

10) Ai present, he isn't working in an office. He doesn't like to work there

- Tobe hay gì bạn

-  Do your friends stay at home??

Để có kết quả là -1/b thì a phải là -2/10 rút gọn còn -1/5. Vậya=-1

Ta có: mẫu số chung là 10. Vậy b=10

=>-1+10=9

- hic, lớp mấy dễ vậy

Why are you absent from class today???

 "Đừng dùng kèn hối thúc, hãy dùng để cảnh báo! "

"Uống thêm một ly dễ đi Chợ Rẫy"