What made the scientists puzzled is __they should call the n

What made the scientists puzzled is __they should call the n What has puzzled the scientists most is that a slight change 一道高中英语单选题What made the professor puzzled was ____ fewer and We were puzzled about the situation,______what we should do It is the most bad call i have ever made Who is the best scientists? what is the world made up What is the sun made up of? when( ) the question,the boy looked puzzled and made no answ The crops should be carried away,__they will be washed away Chinese scientists have made a great__in genetics in the pas The scientists sudden _____(die) made us very sad.