The police recommended parents __________their children under 12 to ride to school for safety.

Hardly had she walked out of the woods ＿＿＿ she heard the strange scream coming from behind a tree.

Raising environmental awareness wasthe aim of our art exhibition ____ last week

Last year my old college friend Melissa _________ her family business, a company supplying metal boxes to other factories.

He smiled politely ________ Mary apologized for her drunken friends(2012·山东，27)