class work

Dictionary word-Time periods

Exercise 2

1. The era of space exploration started in the 1969s.
2. The computer span has helped to improve global communication.
3. The discovery of the Americas began an epoch of adventure.
4. From 1990 to the year 2000 is the last decade of the 20th.
5. Many colleges in the United States run on a semester system.
6. The president of the United States can only serve two terms of four years.
7. The Civil war was the climax of very important period in the growth of the United States of America.
8. The northern part of the country experience a very cold era in the winter of 1993.
9. The pony express lasted for a span of 18 months.

Exercise 3

1. oppose resist start rebel.
2. protest demonstrate riot improve.
3. plead urge teach request.

Exercise 1: Working out the meaning

1. arid:dry/wet
2. gathering:collecting/scattering
3. plentiful:scarce/abundant
4. particular:special/general
5. nomadic:wandering/farming
6. Accompanied:settle with / went with
7. Expedition:journey/trade
8. laborers:traders/workers

Exercise 4:

1. expedition, journey, voyage, reservation
2. ranchers, farmers, laborers, neighbors.
3. gathering, collecting, hunting, picking.
4. wanderer, tribe, traveler, nomad.