You’d better take something to read when you go to see the doctor ________ you have to wait.[ ]

Did youlisten to Mr.Jackson’s lecture — Yes，I have never heard a _____ one.

(2013·皖南八校第三次联考)A recent survey shows the number of people who shop in stores________，while far more are shopping online

What did the policeman say to you, Liu Ying— He told me ______ my purse in the bicycle basket. It’s too dangerous.

_________, where’s my pen — __________, I don’t know.