Giải thích vì sao lại viết như thế

Giải thích vì sao lại viết như thế
36. They were extremely ________________ to my plight. (sympathy)
37. Let me know if you see anyone acting ________________. (suspicious)
38. Business leaders gave an ________________ welcome to the proposal. (enthusiast)
39. The school appeared essentially ________________ since my day. (changeable)
40. The students are still ________________ of working by themselves. (capability)