Languages across the world are becoming extinct ______ endangered mammals and four times endangered birds.

The relatives of the passengers in the missing Flight MH370 cann’t hide their feelings, _____ they can make sure that the plane will make a safe landing on the airport.

Did you visited the military museum?–Yes. Not until quite recently ________ any idea what a guided missile was like.

Have you heard any news about Sarah—Yes, she was promoted to president of her company, __________surprised everyone.

I found the island a wonderful place for our experiments _______ the hot weather