I really don’t know ______ I had my wallet stolen.
—It is raining hard. Will you go to your friend’s birthday party? —I promised him to go, but the heavy rain really places me in a ______. I’m not sure whether I will go or not.
—Do you think it’s a good idea to make friends with your students ? -- ________,I do .I think it’s a great idea .
The leader of the factory told us that very little ___ was made of the waste material in the past.
As I know, there is __________ in this school.
Mike came here ________ to see you, _____ after he heard that you had returned from abroad.