4. When Mary finally got there, Tom had left an hour _____.
Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.
She was so angry and spoke so fast that none of us understood _______ he said meant.
---The weather is too cold ____ March this year.--- It was still ____when I came here years ago.
--- What should I wear to attend his wedding party? --- Dress ____ you like.
He is only too ready to help others, seldom, ____, refusing them when they turn to him.