.Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.
Don’t you think that______________ is no use promising without doing?
Is this the girl______ whom I can turn for help? Is she good at this subject?
_______ our food running out, we had to walk to a village for help.
— Didn’t you enjoy the performance last night? — ___________. It was less wonderful than expected.
It was ______ that they all went swimming in the river.