Do you know David well——Sure. Wefriendssince ten years ago.

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.

1-_______ do you readEnglish books- Three or fourtimes a week.

The old books take up too much room. You should consider how to ______ them. [ ]

you meet with new words when reading English articles , you can guess the meaning first