He _____ be really difficult at times even though he ,generally speaking, is a nice person.

Have you known each other for long—— Not very, ________we started to workin the ABC Motor Company.

Wang Fang ,for ____a correct way will help communicate __others in a foreign country .

The old man sitting opposite me cleared his throat as if ________ something. [ ]

Before you go to Canada, you need to learn more it.