Without facts, we can’t form a correct opinion, for we need to have actual knowledge _______ our thinking.

 Having checked the doors were closed, and ___ all the lights were off, the boy opened the door to his bedroom. 

____ seems strange to us is ______ she can sing so many English songs beautifully.

The Science Museum, ________ we visited during a recent trip to Britain, is one of London’s tourist attractions. 

—Will the match be cancelled because of the bad weather?—No, rain or shine, the match will be held as     .