Trả lời: 1. to2. to3. 04. 05. to6. 07. to8. to9. to10. 0
Trả lời: 1. not swim2. eat3. not play4. to study5. to read6. run
Trả lời: 1. We should stop using fossil fuels or we will have no fresh air to breathe.2. We ought to stop using coal because it pollutes the air.3. Nuclear power is an effective source of energy but it is very dangerous.4. We should look for alternative sources of energy and we will have a better...
Trả lời: 1. b2. a3. c4. b5. a6. c7. c8. a