There are many computers in the office. Make sure _______the door before you leave.

e Li Dazhao, _____ librarian ofBeijing University, was one of the founders of the Chinese Communist Party

ThelocalgovernmentinShenzhenhasrecentlypassedanewregulationforbiddingsupermarketsandstoresto _____freeplasticbagstoshoppers, inabidtoprotecttheenvironment. [ ]

So you gave her your phone—________. She said she’d return it to me when she could afford her own.

It is unfair that so nice a person like Jenny ______ lose her job．She works so hard!