words form ----- Nội dung dịch tự động từ ảnh ----- 20- It's difficult to look ........... when you're embarrassed. (nature) 21- The police have opened an................. into the cause of the fire. (investigate) 22- Her work displays a .............. of imagination. 23- Marine biology is a subject. 24- You should give the students more ......... questions. ( challenge) 25- Mr. Real was very ................ when he read it. 26- I was................. by her performance. (surprise) (fascinate) 27- This medicine can only be .................. used with the doctor's advice. 28- Teachers need to be aware of .................. differences. (culture) 29- Environmentalists are trying to stop the ..................of the rain forests. 30- His performance was very ...... (fun) ..... (poor) (fascinate) (safe) (destroy)