Lawrence Craven is the author of several published reports, one of _____ introduced the idea _____ aspirin could reduce the risk of heart attacks.
More and more people choose to shop in a supermarket as it offers a great ____ of goods.
So difficult ______ it to live in an English-speaking country that I determined to learn English.
For a moment nothing happened. Then ______all shouting together.
At the meeting, the people were _____by the kindness and natural beauty of his mother although there is a scar in her face.
The teacher stressed again that the students should not _____ any important details while retelling the story.