The science of computer, _____rapid progress has been made in recent years, is the most important of all science.
When he was running after his brother, the boy lost his ___ and had a bad fall. A. balance .chance C.memory D.place
Without his wartime experiences, Hemingway____ his famous novel A Farewell to Arms.
Last year was the warmest year on record, with global temperature 0.68 ℃____ the average.
Like ancient sailors, birds can find their way____ the sun and the stars.
______ he once felt like giving up, he now has the determination to push further and keep on going.