1. It is........ (REASONABLE) to regard any language as the possession of a particular nation. 2. If you need any help, you can ask Tom. He's very.......................... (HELP). 3. My daughter spends two hours.......................... (STUDY) mathematics every day. 4. The city has been.......................... (POLLUTE) with toxic waste from local factories. 5. They have tried to increase.................... (PRODUCE) by using better methods and tools. 6. I have a.......................... (TEND) to talk a lot whenever I am nervous. phải làm đúng nhá sai báo cáo đó