Anh/Chị giúp em với ạ!! Question 18: The two boys _____ nervous looks when the teacher said he would check their homework. A. exchanged B. conveyed C. transmitted D. expressed Question 19: Harry made a ______ attempt to take notes during the lecture, but in the end he gave up. A. half-baked B. half-witted C. half-cut D. half-hearted Question 20: Many people are now between a__________and a hard place. They risk being infected with COVID-19 if they venture outside, but they cannot stay inside all the time. A. wall B. block C. stone D. rock