—Is Jissica a diligent student ?—No , but she is a lazy one , if .
. Why does she steal things ________ she could easily afford to buy them?
. My parents would have come to see you if it had been possible, but they ________ so busy.
. 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.