20. He's betrayed your trust. He's betrayed your love for him. (not only...but also)
21.  He felt disappointed. He felt misunderstood.  (both...and)
22. She will have to study hard. She will have to concentrate to do well on the exam (not only...but also)
23. We could fly. We could go by train. (both...and)
24. Fed is my older brother and Peter is, too (both..and)
25. Mary has toothache. She has headache
26. The thief stole my money. He tore up my card (not only...but also)
27. Nam's handsome. Nam's intelligent (not only...but also)
28. She's at the office. She's at the airport (either...or)