Lawrence Craven, a doctor from the US, introduced the idea in 1953 _______ aspirin has the potential to reduce the risk of heart attacks.
______ make her father angry, Joan didn’t tell him her poor grade.
Samuel Clemens,______ Mark Twain, wrote many popular stories.
The old man used _____ in front of his house and he has got used to _______ like that.
You will ______ sooner or later if you keep working like that.
In the USA, the students who study business is more than _______ those who study agriculture.