English is a language that many people around the world ____ not speak perfectly but ____ at least understand.

— You don’t forget when we borrowed that reference book, do you?— I can’t remember now but ________ sometime last week?

I wish I____ my uncle yesterday.

You would have helped your mother do some housework. But you_______.

—Why didn't you answer my phone when I phoned you at about 11 p. m. yesterday? —I ___________and failed to hear the phone.