（Ann and Ben are talking about an air purifier （凈化器）.A=Ann，B=Ben）
A：Good morning，Ben!
B：Good morning，Ann.I haven't seen you for several days.Where have you been？
A：（1）

F

F

B：Back from Shanghai？For holiday or for business？
A：For holiday.（2）

E

E

Look，it's around my neck.You know，I like clean air.
B：We all do.Does it work well？
A：Yes，it works well.（3）

D

D

Air pollution has brought me health problems.
B：It's really a great invention!
A：So it is.It's said that indoor air is two to five times more polluted than outdoor air.
B：How much is it？
A：（4）

B

B

B：I'd like to buy one，too.
A：Why not？（5）

C

C

B：That's great!Your friends will be thankful to you.

A.So I do. B.It's 200 yuan. C.I'll tell my friends about the great invention. D.It can help clean the air around me. E.And I bought an air purifier there. F.I've just come back from Shanghai. G.You can't buy one here.