—Math is too difficult. I want to give it up. —Please don’t. Nothing is _________if you put your heart into it.
—Let's go fishing if it this weekend. —But nobody knows if it .
Betty's never seen a three-D movies,?
—Will Mr. Brown come and play computer games? —No,he has finished, his homework.
Bob is good at all the subjects at school,science.
—Peter said that he would come over to have dinner with you tonight. —But I think he. I have been alone for an hour.