Lawrence Craven,a doctor from the USA,is the author of several published reports,one of ________introduced the idea in 1953 aspirin could reduce the risk of heart attacks.
Operations which left patients ______ and in need of long periods of discovery time now leave them feeling relaxed and comfortable.
America will never again have as a nation the spirit of adventure as it ______ before the West was settled.
I was awfully tired when I got home from work, but a half-hour nap ______ me.
Hardly a month goes by without ______ of another survey revealing new depths of scientific illiteracy among US citizens.
Although she is new here, she seems to be ______ with everyone who comes to the store.