19. If you are not sure _______ your strengths and weaknesses ______, you may ______ a professional expert so that you can develop yourself to the full.
--Have you any oranges and apples? --__________
I know nothing about the young lady ___________ she is from Beijing.
Sandy could do nothing but _________ to his teacher that he was wrong.
Keep up good state of mind even if you___________ fail plenty of times.
--The prison was ___________ fire last night. --Someone must have set fire___________ it.