.The other day I was showing the boys theweekly chemistry experiment when, ________ I knew it, the mixture was bubblingover everywhere.

Scientists are convinced _____ the positive effect of laughter _____ physical and mental health.[ ]

I’m _____ in any _____ book.

Move our eyes quickly over the text to look for some information when we read. Which of the following reading skills do we use

Li Gang was required to apologizethepeople present at the meeting __ what he had done．