Mr. Duncan raised an unnecessary question he then failed to find an answer.
The theory _____ by Einstein was later to prove true, but at that time few people could accept it .
.Was it in 2000_________he was still in middle school_________this boy became an expert at computer?
Can you think of some cases________ drivers obviously knew the traffic rules but didn't obey them?
---You haven’t said one word about the design, Joe. What’s your idea? ---Sorry. I________about something else.
--Have you found your book yet? --- No, I’m not sure where I________ it?