__________________ so incredible is that these insects successfully migrate to places that they have never ever seen. a. That makes the monarch butterflies' migration b. The migration of the monarch butterflies is c. what makes the monarch butterfliis' migration d. The migration of the monarch butterflies', which is 답은c 인데 왜??? It was in 1875 _______ joined the staff of the astronomical observatory at Harvard Univeristy. a. that Anna Winlock b. Anna Winlock, who c. as Anna Winlock d. Anna Winlock then 여기서 답은 a 인데 d는 왜틀렸느지.......then이 잘못쓰였나요? 문법적 설명좀. Inspite of their frightening appearance, the squid is shy and completely harmless 여기서 their 가 틀리다는데 왜? Boolean algebra is most often used to solbe problems in logic, probability, and engineer 여기서 답은 engineer가 틀린건데 most often used는 제대로 쓰인건가요? 설명좀.