The students were ________ over the ________ problem,listening to the teacher with a ________ expression on their faces.
——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.
——How much vinegar did you put in the soup?——I’m sorry to say, ____. I forget.
We hope to go to the beach tomorrow, but we won’t go ____ it’s raining.
Stop making so much noise ____ the neighbor will start complaining.