So desperate ______ that no one could help another, each ____ to save himself and his animals.
A study ________ in the USA in 1977 showed that the chemical ASA in aspirin could prevent a stroke.
It’s obvious that the Beijing Olympic Gamesa great success. A.kept B.showed C proved D.remained
Scientists ____ thousands of chemicals before they decided on the right one in the end.
The deserted island is only _______ by boat.
As is widely acknowledged, a great number of traffic accidents ____ numerous deaths and countless property loss all over the world every year.