been
- Recently there have been many occasions____ you have attended events on your own.
- Safety in school has been of great concern because of frequent reports about accidents _______ students got injured or killed while in school .
- Space exploration has been made ______ with the development of modern science and technology.
- The bank is reported in the local newspaper ______ in broad daylight yesterday
- The Bunsen Burner is so named because it is thought ___________ by Robert Bunsen.
- The holiday we had been looking forward to _________ at last.
- The influence of this book might not have been reaching so far, ________for Mr. William, who dared to publish it.
- This is one of the best films ______ this year.
- This is the first time I ______, so I feel very curious about everything here.
- This problem is said _____ three times.