เฉลย

                                         1. to abide by rules and regulations

                                         2. to attend the conference

                                         3. to be amused {at,by,with}

                                         4. to express our thanks

                                         5. to invent sth

                                         6. to quest for knowledge

                                         7. to be in debt        

                                         8. to make a decision

                                         9. to be excited by    หรือ    to be aroused from

                                         10. to commit a crime

                                         11. to apply for a job

                                         12. to concentrate on sth    หรือ     to concentrate upon sth

                                         13. to keep an open mind

                                         14. to be famous for

                                         15. to impair my reputation

                                         16. to commit adultery

                                         17. to gain

                                         18. to do

                                         19. to be delighted {at,by,in}

                                         20. to gain advantage

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