Do you know how long it has been _________service

I’m too nervous to give a talk before so many people．— _____________, Maria．You can do it．

found guilty. _____, he lost the job and was blamed for incompetence.

The young couple had a quarrel last night and neitherof them would give in to ______

The president of the World Bank says he has a passion for China, ______ he remembers starting as early as his childhood.