I can think of many cases _____ students obviously knew a lot of English words and expressions but couldn’t write a good essay.

Where is my pen ? Have you seen ____?— Oh, sorry. I have taken ____ by mistake.

MsSihastaughtinthisschool_____ 1997.[ ]

____ have you lived here? —Since last year. [ ]

I don’t know if he tomorrow. But if he, I’ll tell you.