____a secretary for five years inthe company, and now he is the general manager of it

You should________your spare time better if you want to be promoted.[ ]

The global financial crisis, ______ started in the USA in 2008, affects almost every country, especially some developed countries.

In the past 30 years China ______great advances in the socialist revolution and socialist construction

The old couple often take a walk after supper in the park with their pet dog them. [ ]