---Will you please repeat your idea?

---Sure. But I don't think that you ________ attention.

A．paid

B．pay

C．are paying

D．were paying

1800÷5×62

90+186-84÷42

491-（25+20）×4

365×8×125×2

57×48+52×57

69×[（580-445）÷9]．