Mr. Bill Clinton was elected ____ President of the United States in ____ 1990s.
.Mary is a(n) _______ customer, so the waiter knows her likes and dislikes.
.Recently I bought a ticket for Shanghai World Expo, _______ was very reasonable.
.---I’d like to call you at 10 o’clock next Friday morning if it is convenient. ---I’m afraid I _______ an important meeting.
._______ in the book, he didn’t notice my coming.
.Although this medicine can cure you _______ your illness, it has a bad effect ______ you.