15.(A). Tim can’t walk around campus because he has class every day.
(B). Tim lives too far away to always walk to campus.
(C). When Tim lived near school, he worked after class every day.
(D). Since Tim works at school, he would like to live closer to campus.
16.(A). You probably heard this news already.
(B). Don’t tell anyone about this.
(C). You must get the information without help.
(D). Don’t try to hide any information you get.