The rescuers _______ to work as soon as they arrived at the spot of the accident

― It was a wonderful trip. So, which city did you like better, Paris or Rome― . There were good things and bad things about them.

Her work changed the way _______ people think about chimps.

As is _______ known, a good knowledge of basic physics helps us better understand natural phynomenons

It was the second time that we ________ in holding such important parties.