Lawrence Craven, a doctor from the USA, is the author of several published reports, one of which introduced the idea in 1953 ________ aspirin could reduce the risk of heart attacks by thinning blood.
refuse
twice
They _______ me 300 yuan for the bike but I brought down the price to 250 yuan.
As regards health, I have nothing _____ to say since I have ________ of illness.
I have bought two ball-pens, _______ writes well.