Mike was usually so careful, ______this time he made a small mistake.
Professor Smith, along with his assistants, _____ on the project day and night to meet the deadline.
20.Tell John not to leave the house unless he_____________that the lights .
19.Mrs.Brown is so_________about her housework that few servants Want to work for her.
18.After you have used the dictionary,please just put it back_________it belongs.
17.Now, boys,I’ll_________the story where I stopped yesterday.