— May I remind you that a Mr. Smith is waiting outside, sir? — Oh, that’s right. I ______ about it.
I don’t think _____ possible to master a foreign language without much memory work and practice.
Work hard at your lessons, ______ you’ll fail the exams again.
He devoted all the time _____ his research .
Mr. Liu dreamed ____ a big house for his parents after they retire.
On the bus I saw a student____ I thought was your brother.