大学英语1期末考试复习

His face burnt with _____________ when he discovered that he had neither his wallet nor his smartphone with him to pay for the meal he had ordered. 

Some people believe that the earth can ________ enough food to support at least twice its present population. 

Mary was a careful speaker; every word seemed to have been ________ before it was allowed to escape through her lips. 

Thanks to the ________ of the huge metro system in the city, transportation in Shanghai has never been this easy.