China’s new food law provides for a food recall system _______ producers have to stop production if their food isn’t up to standards.
Someone is ringing the doorbell. Go and see ______.
“Where _______ go to work?” “Where _______ go to work is not known.”
None knows if _______ that boy, but if _______ him, her parents will be disappointed.
When ______ leave for Japan?” “When ______ leave for Japan is kept secret.”
“Is ______ you want to say?” asked the teacher.