How come you stepped into the lab with your shoes on? You’re ________to take them off before you enter it. I told you so.

(2013·青岛调研)Military helicopters dropped food and medicine to the earthquake survivors that remained ________ in remote mountain villages.

The doctor told Sara to ____ on smoking but she just couldn’t. 

 My brother ______French while he was working in Paris, and he could speak it very well.

Everyone was silent as the judge__________the winner of the artistic gymnastics competition.