How ______ universe came into being is a puzzle to ______ scientists of all generations. A. the; 不填 B. an; the C. a; 不填 C. 不填;the
17. By this time next summer, you _____ a high paying job. But I will still be studying.
16. ----It’s getting dark, but Mr. Johnson is still at his office. ----No surprise. Who else can _____ he does?
15. Three quarters of the land here _____ wet land, an ideal place for migrating birds.
14. After a _____ walk, she couldn’t move forwards any more.
13. The British Isles are a group of islands that lie_____ the west coast of Europe, and the island justBritain is called Ireland.