1. Ruth (rose) early, (made) coffee and (ate) her breakfast. 2. She (had become) an excellent player by the time she finished school. 3. The party had already (started) by the time I (arrived). 4. Was she (asked) this question yesterday? 5. Their school (celebrated) its 50th anniversary in 1998. 6. I (began) to adjust to my new life at college after I (had been) there for three months. 7. I (was reviewing) grammar rules before the test when my computer (start) to blink. 8. She was upset, because she (had not managed) to prepare for the test. 9. Were they nervous before the test yesterday? 10. What did the director (say) to you when you were in his office? 11. He was dizzy. He (had been working) on the computer all night. 12. John (was reading) an economic book, while Ted (was looking through) some magazines. 13. I do not remember exactly how long ago it (was). 14. The boy (received) two letters from his parents since the time he (had arrived). 15. Dave (did not give) any explanation why he (was) late for school.
1)about 23,000 years ago, a single group splintered off from an east asian population. the group, hailing from northeast asia, crossed the bering land bridge between northeast asia and alaska, eventually making their way to the rest of the americas. about 13,000 years ago—much more recent than previous theories—native americans started to split into different groups, creating the genetic and cultural diversity that exists today. 2)as far as i know, there is the theory of the land bridge. 3)they are from asia. 4)- 5)nowadays, native americans live in america
